This is one of the best surreal film ever made right along Alejandro Jodorowsky's "Fando and Lis", Frank Zappa's "200 Motels", and Wojciech Has's "The Saragossa Manuscript." The film is based on Terayama's original play and series of his haiku about his childhood (IMDb's biography on Terayama is excellent and will give you in-depth view of Terayama's art.) The film has timeless Freudian theme about the adolescent trauma, loss of innocence, and deconstruction of self and memories.