Cambridge has also been called the “City of Squares” by some, as most of its commercial districts are major street intersections known as squares. Because most streets were laid out centuries ago, few of these squares resemble a geometric square in any way—Harvard Square is in fact formed by two converging curved streets. Each of the squares acts as something of a neighborhood center. These include: Kendall Square, Central Square, Harvard Square, Porter Square, Inman Square and Lechmere Square.