From the outside, 9 Ash Street in Cambridge, located at the intersection of Ash street and Acacia street, shows nothing more than 9-foot high plywood wall with a discrete door containing a number, a doorbell and a mailbox. Behind this fence, one can find the Philip Johnson Thesis House (1943), a courtyard-style rectangular house that the architect Philip Johnson (1906-2005) designed and built as his thesis project, in order to receive his Architecture degree from Harvard University's Graduate Sc...