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" 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. "
― Jane Jacobs , The Death and Life of Great American Cities
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" Under the seeming disorder of the old city, wherever the old city is working successfully, is a marvelous order for maintaining the safety of the streets and the freedom of the city. It is a complex order. Its essence is intricacy of sidewalk use, bringing with it a constant succession of eyes. This order is all composed of movement and change, and although it is life, not art, we may fancifully call it the art form of the city and liken it to the dance — not to a simple-minded precision dance with everyone kicking up at the same time, twirling in unison and bowing off en masse, but to an intricate ballet in which the individual dancers and ensembles all have distinctive parts which miraculously reinforce each other and compose an orderly whole. The ballet of the good city sidewalk never repeats itself from place to place, and in any once place is always replete with new improvisations. "
― Jane Jacobs , The Death and Life of Great American Cities