European contributions to the early patterns of settlement are based, in part, on site consideration, security, ease of survey, health and fire concerns, uniformity of plan, water and transportation access, and an ambivalence toward nature and the city. Between two rivers. One by two mile grid. A green country town which will never be burnt and always be wholesome. Liberty lands of Philadelphia.
Open space creates ward focus.
Ward is 12 block cellular unit. Repetition orderly but not monotonous. Important buildings face on to square. A common round the town for the convenience of air. Ordinance of 1785 .