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This is an ambiguous motion stimulus. At first it looks like four pairs of dots, each rotating about a common centre, but after a while it perceptually reorganises into two large squares (with a dot at each corner) floating over each other. These local and global forms of "common fate" often alternate; on a 30 s trial, local motion is usually seen first, followed by global motion. And across a series of trials, global motion is gradually seen more often. This suggests two adaptation (or learning) processes with different time constants.