Quote:
Originally Posted by GeoffC
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No, that's not it. I've added another picture with the centre removed (because I've also turned off anti-aliasing with the new picture, and the centre detail is too fine to work without anti-aliasing).
If there is any apparent warming of the colours towards the centre, it's an artefact of the conversion from an eps to pixels.
The illusion isn't a small effect that you have to strain to see.
I might be without internet access over the weekend — I'll post the answer to this puzzle on Monday.