Walter Gropius “The Bridge Builder”Portfolio Print Kawneer Architectural Products. The Bridge Builder is second in a series of five. The portrait was illustrated by Scottish artist Wilson McLean, 1981. This was distributed by Kawneer Architectural Products in 1981 to celebrate the companies 75th anniversary. The Bridge Builder is second in a series of five. Featuring an illustration of Walter Gropius, a German-American architect and founder of the Bauhaus School. This illustration Highlights some of his most influential work.