If children are transferred from a lively city street

In real life, what significant change does occur if children are transferred from a lively city street to the usual park or to the usual public or project playground?

In most cases (not all, fortunately), the most significant change is this: The children have moved from under the eyes of a high numerical ratio of adults, into a place where the ratio of adults is low or even nil. To think this represents an improvement in city child rearing is pure daydreaming.

  1. ​The ground plane​

Sennett discusses playgrounds and childhood learning to some extent in The Craftsman. The linked extract isn't quite what Jacobs is getting at, but it's the closest I've got recorded at this point.

A Pattern Language also has a number of patterns dealing with childhood and adolescent growth.