There's a well-known illusion where you have a bunch of identical blue
squares, each surrounded by a different background, and it makes the
blue squares look like they're all different shades of blue (even though
they are in fact identical).
However, for some reason, I can't get this particular illusion to work.
Take a look at the attachment. All the blue squares are clearly and
obviously the same shade of blue. WTF?
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