It's a very salutary thing to realize that the rather dull universe in which most of us spend most of our time is not the only universe there is. I think it's healthy that people should have this experience.
LSD is a psychedelic drug which occasionally causes psychotic behavior in people who have NOT taken it.
I was on acid and I looked at the trees and I realized that they all came to points, and the little branches came to points, and the houses came to point. I thought, 'Oh! Everything has a point, and if it doesn't, then there's a point to it.
Life lived in the absence of the psychedelic experience that primordial shamanism is based on is life trivialized, life denied, life enslaved to the ego.