I am also looking at what caused me to go for my camera rather swiftly. There is no trickery whatsoever about this photo. It was simply the case that, by a whole range of natural chances to do with the length of branches, the growth of nettles, a gap between a tree and a bush and so on, I was presented, in this particular evening light, with a sizeable and almost perfect circle.
Strange, I thought. And rather beautiful.