The master bath is a little naughty, a little Zen and a little luxe. The space is a glass box with floor-to-ceiling windows overlooking the wooded landscape. The effect is extremely relaxing, after one realizes that only the trees can see in. Robinson and her husband, Paolo, also designed the slate sink, fabricated in Italy. And as homage to his origins, the material is quarried from the same Italian hills where Paolo was raised.