“...what one commonly takes as 'the reality,' including the reality of one's own individual person, by no means signifies something fixed, but rather something that is ambiguous-that there is not only one, but that there are many realities, each comprising also a different consciousness of the ego.”
Source : "LSD: My Problem Child". Book by Albert Hofmann. Chaoter 11: "LSD Experience and Reality", www.psychedelic-library.org. 1980.