This old squirrel went on a little explore recently and ran across a set of clever human constructions, all of stone.
First, a path put in on an awkward slop. Ol’ Wally thinks this is a smooth enough surface for humans to travel, but it is also rough enough to slow running water on the slope, and since it’s permeable, hopefully some of the water is absorbed into the soil in a light rain.
Second, this nice rock wall around a storm drain keeps the soil from filling it in.
Third, this long, low stone, between a tree bed and a path…it’s not high enough to really serve humans, so I’m not sure what they use it for. But as a squirrel, I thought it made a great running platform.