From http://en.wikipedia.org/wiki/Image:Glue1_800x600.jpg

Natural fractal pattern - air displacing a vacuum formed by pulling two glue-covered acrylic sheets apart. The air travels in the direction the horns are pointing, creating dendritic structures into the glue in an effort to equalize the pressures in the room and between the sheets. Created and photographed by user Foobar in Wikipedia English on February 15, 2004. Image 1 of 2.

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