The final piece to the residential compound, XSmall, what-the-hell-is-this is three rotated 16-by-22-foot boxes with four-corner-skylights, giving rooms natural light with minimum windows and maximum privacy, something that is all too important when there are four houses on just two lots, especially when the designs draw as much attention as they do. The house is finished in marine plywood, usually used in boat-building. The grain is broad and pronounced, creating the appearance of a huge piece of furniture. Each floor of XS has a different look and feel (marble on the first floor, oak plywood on the second), but all are connected by a pared-down wooden staircase that threads through the space.