In this visual riff on Pink Floyd’s album “The Wall,” successful but drugged-out musician Pink (Bob Geldof) is looking back on his isolated childhood from the confines of a Los Angeles hotel room. Through a swirl of flashbacks and chemical-induced hallucinations, Pink recalls his lonely upbringing, during which he built a symbolic wall to the world as he coped with the death of his father (James Laurenson) and the overbearing ways of his mother (Christine Hargreaves).