A huge collection of visual illusions: Optical Illusions and Visual Phenomena.
One of my all-time favourite illusions:
Yes, the squares A and B are EXACTLY the same colour. The human visual system does so much pre-processing that it recognises that the cylinder is casting a “shadow”, and edits the perceived image such that you see a colour much nearer the colour that would have been there, were it not for the shadow.
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