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Optical illusion

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Processing Advent Calendar 2011 2011.12.25 参加スケッチ http://blog.p5info.com/?p=849 http://atnd.org/events/22563 クリックで背景の格子を消します。 キーボードの適当なキーを押すと枠を表示。 作った本人がいうのもアレだけど、これ絶対黒と白別々に動いてるよ。
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