The opening tracking shot of a hotel hallway that resembles a prison should clue you in as to what awaits. There are so many things to like and be fascinated by in this movie. And for all of its avant-garde leanings, this is actually a very classically designed story. An iconoclastic music star, Pink Floyd, tries/tries not to think about his past and how he got to where he is, which is borderline psychotic. And because he's so disturbed, he can't even think in a linear way, so the journey we take into his mind is necessarily whacked-out.
We also get to see how fascism is born from misdirected hate and idolatry. As a rock star, Floyd has seen the adulation of his audiences, so he's familiar with the phenomenon. But at the same time, he detests them for buying into his act. It's like the old Groucho Marx joke about refusing membership to any group who would let you in. He knows he's a fake (his teachers and people like his wife have told him so), so everyone else who thinks he's real must be fakes also. It's a big cyclic game. So he can't let any of them in, behind his wall, because they are, by definition, phony.
It's interesting, also, to think about how he has turned full circle into fascism. It's just part of his dream and how he deals with his anger, but it's also an interesting reaction to the absent father. Had there been no homosexuals or Jews etc., there would have been no need for a Hitler, and therefore there would have been no need for his father to die. But instead of hating Nazis, he hates the people that "provoked" the Nazis. (I could go on for days with stuff like this, but I'll stop here.)
Just watch the movie and be impressed with the way it works on so many levels.
