Food of the Gods: The Search for the Original Tree of Knowledge by Terence McKenna (1992) is a radical investigation into the role of psychoactive plants and substances in human evolution, culture, and consciousness. McKenna argues that human intelligence, self-reflection, and spiritual awareness were catalyzed by early interactions with hallucinogens, and that modern societal "domination" stems from a disconnection from this natural, symbiotic relationship. McKenna advocates for the legalization and responsible use of psychedelics to re-establish a "partnership" with nature. He posits that to save our world, we must move away from the "dominator" mentality that fuels the drug war and repression, and embrace the shamanic understanding of nature as a living, intelligent entity.