image by Eric Medvet, (http://www.panoramio.com/photo/25990)
Quadrilateroí (the "polygon") is a social housing block by Carlo Celli, Luciano Celli and Dario Tognon, up the hills of Tieste, Italy. It’s a superblock, divided by a diagonal street. Each of the 650 apartments has two facades: one to the courtyard and a loggia to the sea / landscape. (google map - link).