Cassavetes’ Shadows “improvises” Beat Generation Manhattan, where two brothers and a sister, black but inexplicably played by two white actors, careening off track to scaled-back sketches of Charles Mingus’ saxophone jazz yearnings. Black and white neon signs blink and the old Times Square looms like the otherworld, naturalistic cordial racism separating the chosen from the downtrodden, both dreaming of making it, of creating something.