Exterior The Bass House, which is known as Case Study House #20B (there were two Case Study Houses numbered 20),  was constructed in 1958 in Altadena, California. The home differs from the other Case Study Homes in that it was built primarily out of wood, instead of steel. Designed by the architectural firm of Buff, Straub, and Hensman who worked closely with the owners, renowned graphic illustrator Saul Bass and his wife biochemist Dr. Ruth Bass--the architects were interested in the possibilities of wood as it pertained to mass production in home construction.  Photo 5 of 11 in A Look at 10 Iconic Case Study Houses in California