Many peoples of North Africa migrate within their buildings in both daily and seasonal patterns to take advantage of the various microclimates the buildings create.
The real world of technology denies the existence and the reality of nature. For instance, there is little sense of season as one walks through a North American or western European supermarket.
Just as there is a little sense of season, there is little sense of climate. Everything possible is done to equalize the ambiance – to construct and environment that is warm in the winter, cool in the summer.
I am fascinated by the Farmer’s Almanac, and the “Planting by the Moon” guide in particular, which has advice such as: “Root crops that can be planted now will yield well.” “Good days for killing weeds.” “Good days for transplanting.” “Barren days. Do no planting.”
I think it’d be funny to make up an almanac for writers and artists, one that emphasized the never-ending, repetitive work of the craft.
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.