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As the reader opens and closes the page, the illustration is pushed and pulled sideways behind the sheet. The result is a pretty nifty illusion of movement. Now, this technique mightn't sound like it would give a convincing result -- after all, there's a lot of black and not much image to see. However, as the animated GIF above shows, the effect is surprisingly impressive. Impressive enough, in fact, to get me wondering if it might be possible to adapt it to work online as users resize their browsers.