Unlike the previous typology (Semi-Detached Houses), these houses are very much the same architectural design separated by an alley. This space is typically used for pedestrian or vehicular access to the rear but one can see that it is the bare minimum required. Its width is so narrow in most cases that it produces a certain "interstitial magnetism" between the two houses. Perhaps it is this relationship that tempers the drive towards differentiation (unlike in Semi-detached houses) and keeps the twins matching. The uncanny nature of a pair of identical houses never fails to make a strong impression within the changing urban fabric, especially in Queens, where it is nearly impossible to maintain a regular order for more than a block.