Corey Chan’s San Francisco home looks like any other in the elevated neighborhood of Anza Vista: simple, two-storied, with large windows to let in sweeping views of the skyline and glimmering bay below. But when Chan, 63, opens his two-car garage, it’s like a portal to another world. Chinese lion heads of seemingly every color, size and style hang from the walls and ceiling. A five-foot tall dragon head, its fanged mouth agape, sits where one would expect a car.