Many people look down upon, seeing the musicians as a bunch of stoners. But they don't realize psychedelica helped rock advance technologically. The psychedelic mindset emphasizes that there are no rules, that imagination is everything. It was an invitation to experiment in the studio, whether or not drugs are actually involved. In the states the psychedelic sound was a bad trip, whereas in the UK it was more optimistic.
Tomorrow never knows'.
There's that whole English tradition of fairy tales and myths and the romance of the lush green countryside etc. Although the scene definitely spawned great bands like Pink Floyd, Love and 13th Floor Elevators, you also see its victims. People like Roky Erickson, Syd Barrett and of course Brian Wilson come to mind. Just a few bands survived. The whole point of 'Kaleidoscope Eyes' is that the genre did not collapse, that it continued through the Summer of Love into Krautrock and progressive rock and psychedelic punk and the psychedelic revival and psychedelic hip hop and the shoegazer movement etc.