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.
These days I am more interested in the reverse case [of Da Vinci's helicopter]: ideas that could have worked many centuries before they actually appeared. The economist Alex Tabarrok calls these “ideas behind their time”
Curious minds want to know why these ideas appeared so late — and whether there might be anything that would prevent delays in future. One explanation is that the ideas aren’t as simple as they appear.
The bicycle is not as straightforward an invention as it seems. To move from ox-hauled cart to human-powered bicycle requires smooth-rolling wheel bearings, which in turn need precisely engineered bearing balls. Modern steel ball bearings were not patented until the late 1700s, and demand from the 19th-century bicycle industry helped to improve their design.