‘Hallucinations,’ by Oliver Sacks - NYTimes.com:
"“Why Kermit?” This was the question asked by a woman who started to have hallucinations of the “Sesame Street” frog many times a day, several weeks after brain surgery. Kermit meant nothing to her, she said, and his shifting moods — sometimes he looked sad, sometimes happy, occasionally angry — had nothing to do with her own feelings. In the beginning, he occupied most of the left half of her visual field, but he gradually began getting smaller."
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