Hendrix' 'purple haze' is about a type of LSD that Owsley manufactured in the sixties. Often people will say that Jimi himself said it was about a dream in which he saw Jesus. What most people fail to realize is that back then, admission of taking illegal drugs was very risky, especially to a big star. You can read about how the dust from manufacturing purple haze pills in the attic of a grateful dead house eventually coated most everything in the house and had them high on LSD 24/7 "smoking dmt just to come down."