Yet another reason for me to go to LA: The Watt Towers. Built single-handedly by Sam Rodia between the 1920s and 1950s, without the aid of scaffolding. These are the pinnacle of Outsider Art.
'Why I build it? I can't tell you. Why a man make the pants? Why a man make the shoes?' - Sam Rodia
More close-up photos of the mosaics here.