Play on lively, diversified sidewalks differs from virtually all other daily incidental play offered American children today: It is play not conducted in a matriarchy.Most city architectural designers and planners are men. Curiously, they design and plan to exclude men as part of normal, daytime life wherever people live. In planning residential life, they aim at filling the presumed daily needs of impossibly vacuous housewives and preschool tots. They plan, in short, strictly for matriarchal societies.