Face recognition in anything. Clouds, flames, woodgrain, the fronts of automobiles, anything where the basic elements of a face can be detected and grouped together. Like that Cezanne painting of the women by the river that's actually a self portrait.
Of course there's an evolutionary advantage for the recognition of a mother's face by an infant, but it also helps reinforce social bonding and gives a predisposition to detect the subtleties of facial expression that are crucial in effective homind communication.
To stray back on topic, I reckon that if you look carefully at the stones of the Longstone Cove, Adam contains an image of a slightly disgruntled fella with a big quiff, possibly Elvis. Really:
http://www.themodernantiquarian.com/post/44559
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