This renders a checkerboard with a shadow falling across it which has a
light gray checker in the middle that matches the same gray shade as a
darker checker in the light. To prove that, you'll probably need to select
one of the checkers in a image editor, copy then paste it back next to the
other.
Rather hastily made scene file, maybe some room for improvement.
--
Farewell,
Bob
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Attachments:
Download 'shadowed checker illusion.pov.txt' (4 KB)
Download 'illusion_checkers.jpg' (31 KB)
Preview of image 'illusion_checkers.jpg'
![illusion_checkers.jpg](/povray.binaries.scene-files/attachment/%3C3d9922d3%40news.povray.org%3E/illusion_checkers.jpg?preview=1)
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