Back at the playground. This peek-a-boo disk in the jungle-gym caught the sunlight in an interesting way. When I look at it my eye sees both convex and concave circles but it's all just holes and light.
@hobgoblinwychwo Neither! It was taken upright. I rotated the photo left to right which mean the pole it is hanging from ( gate fashion) is now at the bottom of the photo - it just seemed ti look better that way. It is a side-angle shot - it's the light coming from behind that creates the confusion to the eye.
