I was revisiting the wooden floor that I tried before, with light falling on it from the window. Using pastels this time at the base instead of watercolour pencils.
Then for some unknown reason I added in the red circle, then varnished up to and around the circle. It is not too bad, honestly - geometrically quite interesting. The variation between varnished and non-varnished is cool as well. Plus it looks a bit like a magic circle or something.
Oh, and the circle is painted into the floorboards to give a 3D effect.