Architects like Roger Hopkins. Carpenters and electricians like him, too. But plumbers? They hate him. It's not that they don't appreciate his stone benches and garden sculpture — but they're the ones who have to install the sinks and tubs he carves from giant boulders.

Hopkins works from an outdoor "studio" in North Palm Springs, Calif. Every so often, trucks come by, delivering huge pieces of stone that Hopkins and his associate, Saori Itose, transform into hot tubs.

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