It was during a trip to Mexico, while strolling through the Oaxaca market, that Benoît Coquil (Brittany, 1989) found a T-shirt that caught his eye. "It featured the face of an old woman with gray hair and a cigarette dangling from her lips, and underneath it read: María Sabina, priestess of magic mushrooms", he recalls. Coquil, a professor at the Jules Verne University of Picardy and a specialist in Argentine literature, had never heard the name of this Mazatec healer and shaman. "I asked a Mexican friend to tell me things," he continues, "and he told me that Sabina had ended up becoming an icon of the movement hippie and of the psychedelic counterculture thanks to the rituals she practiced with hallucinogenic mushrooms."