Half as many people will not support half as many enterprises In a given geographical territory, half as many people will not support half as many such enterprises spaced at twice the distance. When distance inconvenience sets in, the small, the various and the personal wither away. Jane Jacobs, The Death and Life of Great American Cities densitydistancegeographybusinesseconomics
highdensityandovercrowding They hated both equally, in any case, and coupled them like ham and eggs, so that to this day housers and planners pop out the phrase as if it were one word, “highdensityandovercrowding.” Jane Jacobs, The Death and Life of Great American Cities densityurbanism
From hands to machines It has rarely proved practical to produce exactly the same product by machines as we produced by hand. Mechanization requires you produce an equivalent product, not identically the same one. Richard Hamming, The Art of Doing Science and Engineering: Learning to Learn The Nature and Art of WorkmanshipThe Real World of Technology