John Lautner's Walstrom House from 1969 is a deceptively simple treehouse of a home. It's just 1400 square feet and almost entirely made of wood and glass – worlds away from his big-budget concrete experiments of the '60s, more in line with his compact wood-clad homes from the '40s. But there is plenty of Lautner's spatial inventiveness here, and a sculptural quality to every part of the building.