Actually, a bit more than that, on the left is the end of an old mill tailrace. And quite the mill it was, with a proper penstock and wheelpit and everything. Not much left now. But, having given water a channel, it tends to keep using it even after a century or so. I just liked the geometry of everything, so I snapped a snapshot as I took my work photos.

In other news, do you know how tedious it is to unravel umpteen hydrangea buds to squish the little worm in residence in each one? Oy.