My son used to do it a lot as an infant when he was tired. He would also sort of "chant" while he did it and you could see that it's almost like meditation.
He's a pretty sensitive child so I think it's mostly about shutting out other stimuli.
He's five now and does it much, much less; only when he's way overtired.
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Building an artificial intelligence that appreciates Mozart is easy. Building an A.I. that appreciates a theme restaurant is the real challenge - Kit Roebuck - Nine Planets Without Intelligent Life
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