Frank Lloyd Wright's Usonian houses were defined by their native materials, flat roofs, large cantilevered overhangs, and natural lighting. This building block set allows your kids (or yourself) to create their own architectural masterpieces. Made from New Zealand pine, the blocks' shapes are based on a honeycomb grid system, similar to the hexagonal system Wright used to design many of his buildings. A portion of the purchase price goes to support the Frank Lloyd Wright Foundation.