Megalithic art studies by K. Hedges
Classification of phosphenes by Kellogg, Knoll and Kügler (1965)
"Refers in general to sensations perceived by the human brain as
images in the absence of visual stimuli."
Richard Bradley (1989) has applied the concept of phosphenes to
megalithic art with generally positive results.
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Major content related changes: Aug. 27, 2001