[FRIAM] words

[Barry MacKichan]

I confess I haven’t read this email carefully (I’m trying to work 
through my email backlog), but this question reminds me of something I 
read a long time ago, which is that the eye identifies straight line 
because they are invariant under motions of the eye back and forth in a 
single direction. That means that straight lines are the retinal 
patterns that are invariant under a certain class of eye motions.

This works not only for lines but for straight edges. Only a skip and a 
jump from there to Platonic solids. 😉

— Barry

On 30 May 2024, at 14:58, Prof David West wrote:

> prompt: All energy in the universe is expressed in motion. All motion 
> is expressed in waves. All waves are curved. So where do the straight 
> lines come from to make the Platonic solids?
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