If you’re in San Francisco, find House of Shields on New Montgomery near Market. Walk past the bar to the women’s restroom in the back. Go inside and open the door of the stall in front of you. Look for the earthquake crack running through the tiny mosaic tiles on the floor.
Follow it with your eyes until you come to the wall on your left. There, near your feet, someone has painted a pale blue sprout reaching up for light from the crack in the floor.