As children get older, this incidental outdoor activity--say, while waiting to be called to eat--becomes less bumptious, physically and entails more loitering with others, sizing people up, flirting, talking, pushing, shoving and horseplay. Adolescents are always being criticized for this kind of loitering, but they can hardly grow up without it. The trouble comes when it is done not within society, but as a form of outlaw life.The requisite for any of these varieties of incidental play is not pretentious equipment of any sort, but rather space at an immediately convenient and interesting place. The play gets crowded out if sidewalks are too narrow relative to the total demands put on them. It is especially crowded out if the sidewalks also lack minor irregularities in building line. An immense amount of both loitering and play goes on in shallow sidewalk niches out of the line of moving pedestrian feet.

It was the day of the worms. That first almost-warm, after-the-rainy-night day in April, when you bolt from your house to find yourself in a world of worms. They were as numerous here in the East End as they had been in the West. The sidewalks, the streets. The very places where they didn't belong. Forlorn, marooned on concrete and asphalt, no place to burrow, April's orphans.

[Public housing projects] are not lacking in natural leaders,' [Ellen Lurie, a social worker in East Harlem] says. 'They contain people with real ability, wonderful people many of them, but the typical sequence is that in the course of organization leaders have found each other, gotten all involved in each others' social lives, and have ended up talking to nobody but each other. They have not found their followers. Everything tends to degenerate into ineffective cliques, as a natural course. There is no normal public life. Just the mechanics of people learning what s going on is so difficult. It all makes the simplest social gain extra hard for these people.