Nature, sentimentalized Nature, sentimentalized and considered as the antithesis of cities, is apparently assumed to consist of grass, fresh air and little else, and this ludicrous disrespect results in the devastation of nature even formally and publicly preserved in the form of a pet. Jane Jacobs, The Death and Life of Great American Cities respectnature
Think better of it This is, of course, the best way to salvage any kind of sorted-out project, up to the time it is actually built: Think better of it. Jane Jacobs, The Death and Life of Great American Cities respect
The assumption of equality Classic writing, with its assumption of equality between writer and reader, makes the reader feel like a genius. Bad writing makes the reader feel like a dunce. Steven Pinker, The Sense of Style Long, unwieldy sentences respect
Wang tiles Wang tiles (Hao Wang, 1961) are a class of formal systems. They are modelled visually by square tiles with a color on each side. A set of such tiles is selected, and copies of the tiles are arranged side by side with matching colors, without rotating or reflecting them. The basic question about a set of Wang tiles is whether it can tile the plane or not, i.e., whether an entire infinite plane can be filled this way. The next question is whether this can be done in a periodic pattern. In 1966, Wang's student Robert Berger solved the problem in the negative. He proved that no algorithm for the problem can exist, by showing how to translate any Turing machine into a set of Wang tiles that tiles the plane if and only if the Turing machine does not halt. The undecidability of the halting problem then implies the undecidability of Wang's tiling problem. Wikipedia en.wikipedia.org Truchet TilesThe Tiling Patterns of Sebastien Truchet and the Topology of Structural Hierarchy mathalgorithms