A copper tub sits on black ili ili stones, which conceal a drain, so the need for an overflow valve is obsolete. The master garden and lava wall add jaw-dropping views and privacy. Unfortunately, Saint Dizier says, no one really uses tubs like these; everyone uses the outdoor shower instead. “It takes, like, an hour and a half to fill, and by that time it’s cold,” Saint Dizier says. “Copper displaces heat quickly, so the temperature drops fast. They’re beautiful to look at, in any case.”