When San Francisco's sister city of Osaka, Japan, made a gift of Yoshiro Taniguchi's five-tiered concrete stupa to the people of San Francisco in 1968, the city seemed stupefied about what to do with the minimalist monument, and kept clustering boxed shrubs around its stark nakedness. But with some well-placed cherry trees and low, hewn-rock benches in the plaza, the pagoda is finally in its element, au naturel.