Parmenides (ii, corollary)

That the mind knows being in the way that the eyes know color or shape, and yet there is the crucial difference that color and shape are a mixture of subject and object and so could not exist without subject. Color is not just a wavelength, but an interaction of this wavelength and the organs; shape is not just an objective feature of space but also a result of our low velocity relative to c.

This is why so far as we restrict ourselves to sensible objects (as happens in natural science) interaction is the same as to be intelligible. But the fact that we understand this as a compund of more simple realities proves it is a secondary and derivative reality.

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