The phenomenon of experiencing altered states of consciousness has been closely linked to the human being since the dawn of humanity. Across all continents, there have been and still are peoples who practice ecstasy and trance techniques to connect with another reality, the world of spirits and gods, thereby continuously redefining and establishing their own reality and behavioral norms. Many cultures have therefore placed consciousness-altering plants and mushrooms at the center of their collective and individual rituals. Over time, the origin of these sacred plants and their uses have given rise to the most colorful stories. From the peyote cactus in Mexico to the iboga plant in Africa, and to the symbol of good fortune in our cultural sphere, the fly agaric, Samorini's foundational work offers the reader a uniquely detailed insight.