Wavy Pattern
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source code if you'd like.
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The pattern, if it were not waving, would simply be the greyscale value of the x and y coords binary "and"ed together. All the wave does is offset the x and y a little depending on a sin wave that is a function of the opposite variable. Okay, a little to mathy. It just looks cool. Again, read the source for more info on how it works.