Youtube user Brusspup made these animated optical illusions by carefully combining slices of different drawings, then sliding an image of vertical lines over the top. That part is straightforward. The illusion comes in when your brain interprets the small white slits that it sees into larger shapes. He also has a nice tutorial on the technique:
I can understand doing this by hand to learn how this works, but it seems like the perfect kind of task to automate with a computer program. Anyone up to the challenge? [via laughing squid]
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