Georg Simmel, "The Metropolis and Mental Life" (1903)

[O]ne must meet the difficulty of asserting his own personality within the dimensions of metropolitan life. Where the quantitative increase in importance and the expense of energy reach their limits, one seizes upon qualitative differentiation in order somehow to attract the attention of the social circle by playing upon its sensitivity for differences. Finally, man is tempted to adopt the most tendentious peculiarities, that is, the specifically metropolitan extravagances of mannerism, caprice, and preciousness. Now, the meaning of these extravagances does not at all lie in the contents of such behavior, but rather in its form of "being different," of standing out in a striking manner and thereby attracting attention. For many character types, ultimately the only means of saving for themselves some modicum of self-esteem and the sense of filling a position is indirect, through the awareness of others.

In the same sense a seemingly insignificant factor is operating, the cumulative effects of which are, however, still noticeable. I refer to the brevity and scarcity of the inter-human contacts granted to the metropolitan man, as compared with social intercourse in the small town. The temptation to appear "to the point," to appear concentrated and strikingly characteristic, lies much closer to the individual in brief metropolitan contacts than in an atmosphere in which frequent and prolonged association assures the personality of an unambiguous image of himself in the eyes of the other.