Arnold persuaded his client to preserve the paneled walls of the main bedroom, which was previously a den. Now painted Farrow & Ball’s Plummet, they lend cool contrast to Hickory Chair’s Muse bed in caramel velvet and a claw-base mahogany demilune. The bust is a signature Arnold addition: “I have a thing for them,” he says. “I just love a cool texture, an unusual face.”