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Pragnanz is one of the Gestalt grouping principles of shape perception. The Gestalt grouping principles consider that the whole is greater than the sum of the parts, and that we see the simplest or most elegant pattern in a group of objects because normally this is the correct interpretation. Specifically, pragnanz is "good figure." (Interpreting an unfamiliar shape as a combination of simpler shapes.) The other grouping principles are: "good continuation;" (interpreting lines as moving as straight as possible,) "similarity;" (the tendency to group simple objects together,) "proximity;" (proximity to alike objects is more important than similarity,) "common fate;" ( we group together objects that appear to be moving together at the same rate of speed.) and, finally, "closure;" (we assume that the component parts of complex shapes are simple shapes).

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