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29:12 ·
A symbol for the four evangelists in Gothic church architecture. More common is  in Group 26.
Dr. Timothy Leary, a professor at Harvard University during the 1960s, who was fired due to his experiments with LSD and his belief that this drug could be used for expanding awareness of subconscious structures and aspects of the world not perceived in a normal consciousness state, has propagated the sign  as a symbol for the League for Spiritual Discovery.
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