Amanita muscaria
He is known for his views on consuming the mushroom fly agaric or "Amanita muscaria" as a hallucinogenic to achieve religious ecstasy. His book "Magic Mushrooms in Religion and Alchemy", which is an improved second edition of his earlier "Strange Fruit", explores the role that "Amanita muscaria" may have played in various mythologies, belief systems and religious art throughout history, such as Native American Anishinaabeg mythology, the Rig Veda, the Puranas, the biblical Old Testament and New Testament, Gnosticism, the Holy Grail legend, Alchemy and Renaissance painting.