'For the person or persons that hold dominion, can no more combine with the keeping up of majesty the running with harlots drunk or naked about the streets, or the performances of a stage player, or the open violation or contempt of laws passed by themselves than they can combine existence with non-existence'.

- Benedict de Spinoza. Political Treatise. 1677.




Saturday, July 21, 2018

Feyerabend 7


7


‘The new natural interpretations constitute a new and highly abstract observation language. They are introduced and concealed so that one fails to notice that the change has taken place (method of anamnesis). They contain the idea of the relativity of all motion and the law of circular inertia.


‘Galileo replaces one natural interpretation by a very different and as yet (1630) at least partly unnatural interpretation. How does he proceed? How does he manage to introduce absurd and counterinductive assertions, such as the assertion that the earth moves, and yet get them a just and attentive hearing? One anticipates that arguments will not suffice – an interesting and highly important limitation of rationalism – and Galileo’s utterances are indeed arguments in appearance only. For Galileo uses propaganda. He uses psychological tricks in addition to whatever intellectual reasons he has to offer. These tricks are very successful: they lead him to victory. But they obscure the new attitude to experience that is in the making, and postpone for centuries the possibility of a reasonable philosophy. They obscure the fact that the experience on which Galileo wants to base the Copernican view is nothing but the result of his own fertile imagination, that it has been invented. They obscure this fact by insinuating that the new results which emerge are known and conceded by all, and need only to be called to our attention to appear as the most obvious expression of the truth.

Galileo ‘reminds’ us that there are situations in which the non-operative character of shared motion is just as evident and firmly believed as the operative character of all motion is in other circumstances. (The latter idea is, therefore, not the only natural interpretation of motion). The situations are: events in a boat, in a smoothly moving carriage, and in other systems that contain an observer and permit him to carry out some simple operations’


let us hear from Galileo himself –


Sagredo: There has just occurred to me a certain fantasy which passed through my imagination one day while I was sailing to Aleppo, where I was going as a consul for our country….If the point of a pen had been on the ship during the whole voyage from Venice to Alexandretta and had the property of leaving visible marks of its whole trip, what trace – what mark – what line would it have left?

Simplicio: It would have left a line extending from Venice to there; not perfectly straight – or rather, not lying in the perfect arc of a circle – but more or less fluctuating as the vessel would now and again have rocked. But this bending in some places a yard or two to the right or left, up or down, in length of many hundreds of miles, would have made little alteration to the whole extent of the line. These would scarcely be sensible, and, without an error or any movement, it could be part of a perfect arc.

Sagredo: So if the fluctuation of the waves were taken away and the motion of the vessel were calm and tranquil, the true and precise motion of the pen would have been the arc of a perfect circle. Now if I had that same pen continually in my hand and had moved it only a little sometimes this way or that, what alterations should I have brought into the main extent of this line?

Simplicio: Less than that which would be given to a straight line a thousand yards long which deviated from the absolute straightness here and there by a flea’s eye.

Sagredo: Then if an artist had been drawing with that pen on a sheet of paper when he left the port and had continued doing so all the way to Alexandretta, he would have been able to derive from the pen’s motion a whole narrative of many figures, completely traced and sketched in thousands of directions, with landscapes, buildings, animals, and other things. Yet the actual real essential movement marked by the pen point would have been only a line; long, indeed but very simple. But as to the artist’s own actions, these would have been conducted exactly the same had the ship been standing still. The reason that of the pen’s long motion no trace would remain except the marks drawn upon the paper is that the gross motion from Venice to Alexandretta was common to the paper, the pen, and everything else in the ship. But the small motions back and forth, to the right and left, communicated by the artist’s fingers to the pen but not to the paper, and belonging to the former alone, could thereby leave a trace on the paper which remained stationary to those motions.’


Galileo is arguing here that perspective is the key to understanding motion

‘But this bending in some places a yard or two to the right or the left, up or down, in length of many hundreds of miles, would have made little alteration in the whole extent of the line’

the key phrase here is ‘the whole extent of the line’ – and the point is that though we might naturally focus on a part of the line – ‘this bending in some places’ – we can also adopt a broader perspective – the perspective of the whole line

it is this perspective – the larger perspective which gives us the ‘real motion’ of the boat

and if you take the fluctuations out of the analysis ‘if the fluctuations are taken away’ – the alterations to the line ‘would be less than a flea’s eye’

that is you can then ‘see’ the real motion as the arc of a perfect circle

this is strictly speaking an argument against immediate experience – or giving any weight to the perspective of immediate experience in terms of understanding ‘real’ motion

the argument goes on to show that the appearance of being stationary cannot be maintained relative to the perspective of real motion –

an artist drawing in the boat draws pictures of what he sees – ‘Yet the actual real essential movement marked by the pen point would have only been a line; long indeed but very simple – and the reason for this is the ‘gross motion (common motion) of the paper, the pen, and everything else in the ship’

however the immediate actions of the artist’s fingers to the pen – but not the paper – leaves a trace that ‘remained stationary’ – to those motions

what is clear from this argument is that immediate experience is a perspective – just as the so called ‘real’ motion is a perspective

this is not to say that Galileo holds that these perspectives should be given equal weight
                                                                                                                                       Galileo makes clear in this argument that he regards the perspective of immediate experience as limited –                                                                                                                                   
he clearly prefers the perspective of real motion – and his implicit argument for this preference is that it does not suffer the limitation of immediate experience

and the inference of course is that it will have greater application and functionality

now to the second example –


Salviati:…..imagine yourself in a boat with your eyes fixed on a point of the sail yard. Do you think that because the boat is moving along briskly, you will have to move your eyes in order to keep your vision always on the point of the sail yard and follow its motion?

Simplicio: I am sure that I should not need to make any such change at all: not just to my vision, but if I had aimed a musket I should never have to move a hairs breath to keep it aimed, no matter how the boat moved.

Salviati: And this comes about because the motion which the ship confers upon the sail yard, it also confers upon you and upon your eyes, so that you need not move them a bit in order to gaze at the top of the sail yard, which consequently appears motionless to you. (And the rays of vision go from the eye to the sail yard, just as if a cord where tied between two ends of the boat. Now a hundred cords are tied at different fixed points, each of which keeps its place whether the ship moves or remains still).’


the argument here is that the appearance of the sail yard as stationary is no more than a function of the motion of the boat from the perspective of an observer in the boat

as Feyerabend says it is clear that these situations lead to a non-operative concept of motion

(Galileo defines relative motion as motion ‘among things which share it in common’
and that this motion is non-operative in that it ‘remains insensible, imperceptible, and without any effect whatever’)

the first of the above two paradigms of non-operative motion is followed by this statement –


‘It is likewise true that the earth being moved, the motion of the stone in descending is actually a long stretch of many hundreds of yards, or even many thousand; and had it been able to mark its course in motionless air or some other surface, it would have left a
very long slanting line. But that part of all this motion which is common to the rock, the tower, and ourselves remains insensible and as if it did not exist. There remains observable only that part in which neither the tower nor we are participants; in a word that with which the stone, in falling measures the tower.

And the second paradigm precedes the exhortation to ‘transfer this argument to the whirling of the earth and to the rock placed on top of the tower, whose motion you cannot discern because, in common with the rock, you posses from the earth that motion which
is required for following the tower; you do not need to move your eyes. Next, if you add
to the rock a downward motion which is peculiar to it and not shared by you, and which is mixed with this circular motion, the circular portion of the motion which is common to the stone and the eye continues to be imperceptible. The straight motion alone is sensible, for to follow that you must move your eyes downwards.’


Feyerabend says –


‘Yielding to this persuasion, we now automatically start confounding the conditions of the two cases and became relativists. This is the essence of Galileo’s trickery! As a result, the clash between Copernicus and ‘the conditions affecting ourselves and those in the air above us’ dissolves into thin air, and we finally realize ‘that all terrestrial events from which it is ordinarily held that the earth stands still and the sun and the fixed stars are moving would necessarily appear just the same to us if the earth moved and the other stood still.’


Feyerabend argues that Galileo ‘confounds the conditions of the two cases’ – and that this is the essence of his trickery

is this so?

Galileo puts forward a proposal – for relativism and non-operative shared motion

and this proposal – and the argument for it – does reconcile the tower argument with the Copernican theory of motion – thus reconciling operative and non-operative motion

Galileo argues by implication that the theory of absolute motion is limited in that it cannot account for non-operative motion

whereas a relativistic theory does accommodate operative and non-operative motion

the conditions of the two cases are not confounded – they are placed on the equal epistemological footing of relativism

the relativist theory has greater range and applicability –

and it is this greater range and applicability that makes it more useful to science than the Aristotelian idea of absolute motion

Galileo in his argument for the Copernican theory of motion has done some first class philosophical thinking and argument –

and further he has illustrated his argument for non-operative motion and relativism with examples that people can readily understand

it would suit Feyerabend to be able to show that Galileo was some kind of fraud
                                                                                                                                  
this would fit beautifully with Feyerabend’s so called irrationalism

the fact of it is though that on any fair reading of Galileo – all you have is elegantly constructed rational argument –

the only one trying to be tricky here is Feyerabend – and the trick doesn’t work –

what we have from Feyerabend is no real argument – just rhetorical assertion –

and in the best traditions of rhetoric – the attempt to discredit – a decent logical argument

Feyerabend puts forward two paradigms:


‘Let us now look at the situation from a more abstract point of view. We start with two conceptual sub-systems of ‘ordinary’ thought…One of them regards motion as an absolute process which always has effects, effects on our sense included… the arguments of Copernicus’s opponents which are quoted by Galileo himself and, according to him, are ‘very plausible’, show that there was a widespread tendency to think in its terms, and that this tendency was a serious obstacle to the discussion of alternative ideas.’

The second system is built around the relativity of motion, and is also well entrenched in its own domain of application. Galileo aims at replacing the first system by the second in all cases, terrestrial as well as celestial. Naïve realism with respect to motion is to be completely eliminated

Now we have seen that this naïve realism is on occasions an essential part of our observational vocabulary. On these occasions…the observation language contains the idea of the efficacy of all motion. Or, to express it in the material mode of speech, our experience in these situations is an experience of objects which move absolutely. Taking this into consideration, it is apparent that Galileo’s proposal amounts to a partial revision of our observation language or of our experience. An experience which partly contradicts the idea of the motion of the earth is turned into an experience that confirms it, at least as far as ‘terrestrial things’ are concerned. This is what actually happens. But Galileo wants to persuade us that no change has taken place, that the second conceptual system is already universally known, even though it is not universally used. Salviati, his representative in the dialogue, his opponent Simplicio and Sagredo the intelligent layman, all connect Galileo’s method of argumentation with Plato’s theory of anamnesis – a clever tactical move, typically Galilean one is inclined to say. Yet we must not allow ourselves to be deceived about the revolutionary development that is actually taking place.’


‘Now we have seen that this naïve realism is on occasions an essential part of our observational vocabulary. On these occasions…the observation language contains the idea of the efficacy of all motion. Or, to express it in the material mode of speech, our experience in these situations is an experience of objects which move absolutely.

our observational vocabulary can be interpreted in terms of the proposal of naïve realism

and we can have the same vocabulary – without the understanding that objects move absolutely –

that is we can have the same vocabulary – with a relativistic understanding

and in a sense – this is just what Galileo proposes and argues for

‘Taking this into consideration, it is apparent that Galileo’s proposal amounts to a partial revision of our observation language or of our experience. An experience which partly contradicts the idea of the motion of the earth is turned into an experience that confirms it, at least as far as ‘terrestrial things’ are concerned.’

‘a partial revision of our observation language or our experience’

this is a confusing statement

I would put that our experience is not revised – and that our observation language need not be revised –

what is different – is not the experience per se – or even how it is expressed – but rather the understanding

 the understanding of the experience – the understanding of the observation language

in time of course a different understanding can lead to different expressions – changes in the observation language – but this is really incidental –

the real issue is always how the ‘experience’ is interpreted – how it is proposed – how it is understood

and the same is true with the observation language – the issue is what interpretation it is given

the experience itself – neither confirms a theory or contradicts it

what you have in play here is different theories of the experience –  different proposals –

that is where the argument is

and what Galileo does is argue that the relativistic theory –  the relativistic proposal –
can be shown to apply to all motion –

and in so arguing he puts that the proposal of absolute motion is indeed – naïve

and I think you would find that Galileo would see his proposal – as open to question – open to doubt – and therefore – uncertain

but also a proposal that represents the best of his thinking –

and a proposal that he would say should  be taken seriously


‘The resistance against the assumption that shared motion is non-operative was equated with the resistance which forgotten ideas exhibit towards the attempt to make them known. Let us accept this interpretation of resistance. But let us not forget its existence. We must then admit that it restricts the use of the relativistic ideas, confining them to part of our everyday experience. Outside this part, i.e. in interplanetary space, they are ‘forgotten’ and therefore not active. But outside this there is not complete chaos. Other concepts are used, among them whose very same absolutistic concepts which derive from the first paradigm. We not only use them, but we must admit that they are entirely adequate. No difficulties arise as long as one remains within the limits of the first paradigm. “Experience’, i.e. the totality of all facts from all domains, cannot force us to carry out the change which Galileo wants to introduce. The motive for change must come from a different source.’


‘Other concepts are used, among them whose very same absolutist concepts which derive from the first paradigm. We not only use them, but we must admit that they are entirely adequate.’

if a concept is useful in a propositional context – then it will be used

‘No difficulties arise as long as one remains within the limits of the first paradigm.’

this can be argued – but the point really is that what we are dealing with is two different proposals – different paradigms – different theories of experience – different theories of motion

“Experience’, i.e. the totality of all facts from all domains, cannot force us to carry out the change which Galileo wants to introduce. The motive for change must come from a different source.’

Feyerabend is right here – at least in my terms he is right –

‘experience’ as such is an unknown –

that is to say experience – in the absence of proposal – any proposal – is unknown

we propose to make known

there is no known experience – independent of proposal – so no use pretending that there is – or pretending that you can appeal to it

the best you can do is argue for your theory – your interpretation – your proposal for experience – your understanding of experience

while at the same time regarding it as open to question – open to doubt – and as uncertain

‘The motive for change must come from a different source.’ –

‘the motive for change’?

my answer to this is to say that the proposal – in fact any proposal – is open to question – open to doubt – is uncertain

motives and change – are responses to and expressions of propositional uncertainty

Feyerabend continues –


‘It comes, first, from the desire to see ‘the whole [correspond] to its parts with wonderful simplicity’, as Copernicus had already expressed himself. It comes from the ‘typically metaphysical urge’ for unity of understanding and conceptual presentation. And the motive for a change is connected, secondly, with the intention to make room for the motion of the earth, which Galileo accepts and is not prepared to give up. The idea of the motion of the earth is closer to the first paradigm than to the second, or at least it was at the time of Galileo. This gave strength to the Aristotelian arguments and made them plausible. To eliminate this plausibility, it was necessary to subsume the first paradigm under the second, and to extend the relative notions to all phenomena. The idea of anamnesis functions here as psychological crutch, as a lever which smooths the process
of submission by concealing its existence. As a result we are now ready to apply the notions not only to boats, coaches, birds, but to the solid and well-established earth’ as a whole. And we have the impression that this readiness was in us all the time, although it took some effort to make it conscious. This impression is most certainly erroneous: it is the result of Galileo’s propagandistic machinations. We would do better to describe the situation in a different way, as a change of our conceptual system. Or, because we are  dealing with concepts which belong to natural interpretations, and which are therefore connected with sensations in a very direct way, we should describe it as a change of experience that allows us to accommodate the Copernican doctrine. The change corresponds perfectly to the pattern described in Chapter 2 below: an inadequate view, the Copernican theory, is supported by another inadequate view, the idea of the non-operative character of shared motion, and both theories gain strength and give support to each other in the process. It is this change which underlies the transition from the Aristotelian point of view to the epistemology of modern science.’


‘The idea of the motion of the earth is closer to the first paradigm than to the second, or at least it was at the time of Galileo. This gave strength to the Aristotelian arguments and made them plausible. To eliminate this plausibility, it was necessary to subsume the first paradigm under the second, and to extend the relative notions to all phenomena.’

look – which ever view you take – the argument will be that the opposing point of view can be accounted for in your perspective

‘The idea of anamnesis functions here as psychological crutch, as a lever which smooths the process of submission by concealing its existence. As a result we are now ready to apply the notions not only to boats, coaches, birds, but to the solid and well-established earth’ as a whole. And we have the impression that this readiness was in us all the time, although it took some effort to make it conscious. This impression is most certainly erroneous: it is the result of Galileo’s propagandistic machinations’

Galileo presents his argument in a way that is likely to be understood by the common man

propaganda – is opinion – without argument – masquerading as knowledge

now seriously – is Feyerabend going to say that Galileo’s elegant – thoughtful and logical argument – is opinion without argument masquerading as knowledge?

well – apparently so

and it is just here that you have to ask – well who’s the propagandist?

‘We would do better to describe the situation in a different way, as a change of our conceptual system. Or, because we are dealing with concepts which belong to natural interpretations, and which are therefore connected with sensations in a very direct way, we should describe it as a change of experience that allows us to accommodate the Copernican doctrine.’

as Feyerabend illustrates here – the ‘situation’ – can be described in different ways

different descriptions will suit different propositional contexts –

different descriptions will suit different audiences

the logical point is that where there is a change of perspective –

any proposal put to account for the change is open to question – open to doubt – is uncertain


‘For experience now ceases to be the unchangeable fundament which it is both in common sense and in Aristotelian philosophy. The attempt to support Copernicus makes experience ‘fluid’ in the very same manner in which it makes the heavens fluid, ‘so that each star moves around in it by itself’. An empiricist who starts from experience, and builds on it without ever looking back, now loses the very ground on which he stands. Neither the earth, ‘the solid, well-established earth’, nor the facts on which he usually relies on can be trusted any longer. It is clear that a philosophy that uses such a fluid and changing experience needs new methodological principles which do not insist on an asymmetric judgement of theories by experience. Classical Physics intuitively adopts such principles; at least the great and independent thinkers, such as Newton, Faraday, Boltzmann proceed in this way. But its official doctrine still clings to the idea of a stable and unchanging basis. The clash between this doctrine and the actual procedure is concealed by a tendentious presentation of the results of research that hides their revolutionary origin and suggests that they arose from a stable and unchanging source. These methods of concealment start with Galileo’s attempt to introduce new ideas under the cover of anamnesis and they culminate in Newton. They must be exposed if we want to arrive at a better account of the progressive elements in science.’


‘An empiricist who starts from experience, and builds on it without ever looking back, now loses the very ground on which he stands. Neither the earth, ‘the solid, well-established earth’, nor the facts on which he usually lies can be trusted any longer.’

the ground of our knowledge of the world – if we are to still run with such an idea –

is open to question – open to doubt – is uncertain

any proposal we put is open to question – open to doubt – is uncertain

we can describe where we start – as ‘starting from experience’ –

however to start here – is no different – logically speaking – than any other proposed stating place –

it will be open to question –

which is to say that the proposal ‘experience’ – or whatever your proposal is – is open to question – open to doubt – is uncertain

a proposal – is put – not ‘trusted’ – and ‘facts’ are proposals – open to question

we begin – logically speaking – in propositional uncertainty

as to an ‘official doctrine’ – I guess that depends on whether you think there are ‘officials’ in science – and if so – who they are

science is a critical study of proposals – of propositions –

who puts a proposal – is irrelevant

and yes – science as with any propositional activity has a rhetorical dimension –

however the rhetoric of science is about its presentation – not its substance –

we need not make rhetoric our focus – unless it gets out of hand

Feyerabend goes on about Galileo’s so called ‘methods of concealment’ –

as I see it Galileo presents his argument is a way that makes difficult philosophical and scientific issues – readily understandable to a scientifically illiterate populace –

his ingenious and successful presentation of his argument – may well explain why it gained support

‘exposing’ his presentation – is neither here nor there – and hardly worth a mention

what is important is the argument – the philosophical argument – the proposal
that he advances in response to the Copernican problem –

a brilliant proposal – a brilliant argument – and one that is open to question – open to doubt – and uncertain

I think Galileo would agree with that


‘My discussion of the anti-Copernican argument is not yet complete. So far, I have tried to discover what assumption will make a stone that moves alongside a moving tower appear to fall ‘straight down’, instead of being seen to move in an arc. The assumption which I shall call the relativity principle, that our senses notice only relative motion and are completely insensitive to a motion which objects have in common, was seen to do the trick. What remains to be explained is why the stone stays with the tower and is not left behind. In order to save the Copernican view, one must explain not only why a motion that preserves the relation among visible objects remains unnoticed, but also, why a common motion of various objects does not effect their relation. That is, one must
explain why such a motion is not a causal agent. Turning the question around … it is clear that the anti-Copernican argument …rests on two natural interpretations: viz., the epistemological assumption that absolute motion is always noticed, and the dynamical principle that objects (such as the falling stone) that are not interfered with assume their natural motion. The present problem is to supplement the relativity principle with a new law of inertia in such a fashion that the motion of the earth can still be asserted. One sees at once that the following law, the principle of circular inertia as I shall call it, provides the required solution: an object that moves with a given angular velocity on a frictionless sphere around the centre of the earth will continue moving with the same angular velocity forever. Combining the appearance of the falling stone with the relativity principle, the principle of circular inertia and with some simple assumptions concerning the composition of velocities, we obtain an argument which no longer endangers Copernicus’ view, but can be used to give it partial support.


yes – a good argument from Feyerabend  – a good proposal in support of the Copernican view –

clearly though – a  proposal open to question – open to doubt – and uncertain


‘The relativity principle was defended in two ways. The first was by showing how it helps Copernicus: this defence is truly ad hoc. The second was in pointing to its function in common sense, and by surreptitiously generalizing that function (see above). No independent argument was given for its validity. Galileo’s support for the principle of circular motion is of exactly the same kind. He introduces the principle, again not by reference to experiment or to independent observation, but by reference to what everyone is supposed to know.’


Galileo put forward a proposal – and argues for a change of perspective

what Galileo simply does is say – if you understand my argument and accept my argument – you will see the inherent sense of its conclusion

and you will see and understand the physical world differently

no great conspiracy or deception there

and yes Galileo does not claim that his proposal is based on ‘independent argument for its validity’

perhaps he did not think there is such a thing


 Simplicio: So you have not made a hundred tests, or even one? And yet you so freely declare it to be certain? …

Salviati: Without experiment I am sure the effect will happen as I tell you, because it must happen that way; and I might also add that you yourself also know that it cannot happen otherwise, no matter how you might pretend not to know it …but I am so handy at picking people’s brains that I shall make you confess this in spite of yourself.’


this is not Galileo’s finest moment – what we have here is rhetoric – pretentious rhetoric


‘Step by step, Simplicio is forced to admit that a body that moves, without friction, on a sphere concentric with the centre of the earth will carry out a ‘boundless’, a ‘perpetual’ motion, that what Simplicio accepts is based neither on experiment nor a corroborated theory. It is a daring suggestion that involves a tremendous leap of the imagination. A little more analysis then shows that this suggestion is connected with experiments, such as the experiments of the Discorsi, by ad hoc hypotheses. (The amount of friction to be eliminated follows not from independent investigations – such investigations commence only much later in the 18th century – but from the result to be achieved, viz. the circular law of inertia.) Viewing natural phenomena in this way leads to a re-evaluation of all experience, as we have seen. We can now add that it leads to the invention of a new kind of experience that is not only more sophisticated but far more speculative than is the experience of Aristotle or of common sense. Speaking paradoxically, but not incorrectly, one may say that Galileo invents an experience that has metaphysical ingredients. It is by means of such an experience that the transition from a geocentric cosmology to the point of view of Copernicus and Kepler is achieved.’


‘what Simplicio accepts is based neither on experiment nor a corroborated theory. It is a daring suggestion that involves a tremendous leap of the imagination.’

what is put to Simplicio – is a proposal –

and yes it is daring – and a leap of the imagination –

this is all very well – the logical point is that this proposal – is open to question – open to doubt – and daring and imaginative as it is – it is as a proposal – uncertain

‘Viewing natural phenomena in this way leads to a re-evaluation of all experience, as we have seen. We can now add that it leads to the invention of a new kind of experience that is not only more sophisticated but far more speculative than is the experience of Aristotle or of common sense. Speaking paradoxically, but not incorrectly, one may say that Galileo invents an experience that has metaphysical ingredient.’.

yes – viewing natural phenomena in this way – leads to a different understanding of experience

it is not the invention of a ‘new kind of experience’ 

it is a new interpretation of experience – a new theory of experience –

it is a new proposing of experience

and yes it can be seen as a more sophisticated theory than that of Aristotle – or of common sense

and if it is held open to question – open to doubt – and regarded as uncertain –

it will be springboard for speculation – speculation that is logical

Galileo doesn’t invent an experience – he puts up a proposal for how we can interpret experience

as to the ‘metaphysical ingredient’ –

what theory of reality – is without a metaphysical ingredient?

or to put it more precisely –

what proposal – cannot be analysed in metaphysical terms?