Created for a contemporary-art collector, this 2,250-square-foot, one-bedroom home north of Manhattan serves as a personal retreat from the city. Its concept centers on four identical cubes — defined by sets of parallel concrete-block walls — rotated in relation to each other as they line up to form a rectangular residence. Equal in size, each contains a single central function: eating, sleeping, bathing, relaxing. Six-foot-wide glass enclosures connect the cubes, allowing square footage to expand in either direction, to create a larger living space, for instance. The house sits next to a wooded landscape, but the owner’s need for wall space for art took precedence over large windows capitalizing on the views. A long tree-lined drive does take advantage of the setting, however, shielding the structure from the public and making for a dramatic reveal.