Ancient Burial Site?

In a thousand years, who knows what our descendants will make of these strange shapes?  It's a circular maze in a bit of "green space" on the edge of the village.  It was part of the Section 106 spend by the developer of the housing next to it (see Extra) and it is a very welcome place to go for a short walk.

In the Extra shot (the last one of my ration – why is it rationed?) you can see that the little brook is almost in spate.  This is looking south at 250 to 300ft above ground.  That's the lowest height that fast jets are cleared to fly at in the open airspace (not over towns or villages) so you see that it's really quite low.  And very exciting to do . . .