Though it seems determined to ignore the adjacent kitchen, the dining area in this Manhattan prewar apartment, decorated by New York interior designer Robin Henry, hangs together on its own terms. The 1960s rosewood Z chairs, designed by Dane Kai Kristiansen, reflect the angled lines in the parquet floors, and the ikat upholstery, with its jagged pattern, keeps up the beat like an electrocardiogram. While offering welcome relief from all that zig-zagginess, the simple bench is upholstered in a solid purplish-brown fabric that picks up on a color in the chairs’ material, connecting the bench to the...