Pebble erosion

Shape evolution of a 5 x 5 x 0.5 cm³ square pebble eroded in a rotating basin, depicted on the lower right, with roughly 300 cutting events between each photograph. The time sequence is left to right, and top to bottom. The erosion is due to small random cutting events, due to collision with the boundary, a particularly large example of which is highlighted by the arrow in the third photograph (image and text: Phys. Rev. Lett. 97 028001).

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