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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Preview of image 'colours.png'