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You don’t have to be a magician (David Copperfield, David Blaine, David … you get the idea) to fool the eye into seeing something that isn't there. In fact, all you need to pull off a mind-bending, look-twice trick is a piece of paper, some colored pencils or markers and the fun op-art technique I'm about to teach you.
Credit to matwalaboy @ hukd
Thanks OP!
FYI the US link still redirects to the AU site.