Summary Irish passage‐tomb art has been interpreted as a representation of endogenous visual phenomena associated with consciousness‐altering practices. This paper describes an analysis of passage‐tomb art in which a detailed breakdown of shape distributions is used to identify the specific means of inducing these visual phenomena at each tomb. This suggests three major sources for the art: migraine, light flicker and hallucinogenic substances, which are evident in different combinations at different tombs.
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Jeremy Dronfield (1995) studied this question.
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