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Optical illusion

Processing Advent Calendar 2011 2011.12.25 参加スケッチ 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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