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'