Is symmetry of stone tools merely an epiphenomenon of similarity?

Behavioral and Brain Sciences 25 (3):406-407 (2002)
Abstract
It is proposed that symmetry of stone tools may derive from perceptual similarity rather than from cognitively more complex awareness of symmetry. Although encodement of shapes necessarily involves symmetry (as evidenced by the confusability of enantiomorphs), it does not imply awareness of symmetry. Responses of relatively simple organisms, such as bees, support the notion that the processes involved are likely to be perceptual.
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