To be shaken out of the ruts of ordinary perception, to be shown for a few timeless hours the outer and inner world, not as they appear to an animal obsessed with survival or to a human being obsessed with words and notions, but as they are apprehended, directly and unconditionally, by Mind at Large -- this is an experience of inestimable value to everyone and especially to the intellectual.
-- Aldous Huxley, "The Doors of Perception"