On Capp Shotwell Street, an alley-like little street that runs down the east side of the Mission district in San Francisco. There’s one block, between 16th and 17th streets, that always has some visual surprise despite the superficially bland surroundings (a health clinic and a few two-flat buildings on one side of the street and what looks like a garage or maintenance building on the other side). Up there, that’s a window of the garage, as seen yesterday morning.