"In my own experience, which is shared by very many others, psychedelics expand attention. They make the spotlight of consciousness a floodlight which not only exposes ignored relationships and unities but also brings to light unsuspected details—details normally ignored because of their lack of significance, or their irrelevance to some prejudice of what ought to be. There is thus good reason to believe that the psychedelics are the opposite of hallucinogens insofar as they decrease the selectivity of the senses and expose consciousness to events beyond those that are supposed to deserve notice."

Alan Watts “A Psychedelic Experience Fact or Fantasy?” 1964