Cycling country lanes in Somerset this week, I notice how the sand accumulates in the middle. The two side tracks are clear, but stay away from the middle, where your tires will skid.
It’s almost the same principle as the celebrated Chladni patterns. On Chladni’s plates, the sand accumulates along nodal lines because elsewhere it gets bounced away. In the lanes of Somerset, much the same.
[18 July 2020]