Ernst Jünger
The term "psychonautics" derives from the prior term "psychonaut", usually attributed to German author Ernst Jünger who used the term in describing Arthur Heffter in his 1970 essay on his own extensive drug experiences "Annäherungen: Drogen und Rausch" (literally: "Approaches: Drugs and Inebriation"). In this essay, Jünger draws many parallels between drug experience and physical exploration—for example, the danger of encountering hidden "reefs."