Circles

Today's challenge was to photograph circles.

So here are some circular shapes - large, small, layered. But what can they be?

It is a macro shot (you could probably guess) of soap bubbles on the surface of water. The water was in a small glass lit from the top by window daylight and from the bottom by table lamps shining through red and green filters to add a little colour.

The structure of the soap film is astonishing when viewed at this enlargement.