For a Mill Valley house, designer Gary Hutton helped curate furnishings for his art collector clients. In the living room, ‘Eternity Domain,’ 1989, by Jules Olitski hangs above a Jens Risom sofa covered with a striped Nobilis velvet. The wing chairs and a marble-topped coffee table are by Gio Ponti, and the bamboo-silk rug is by Niba Rug Collections.