I had this image kicking around on my computer for quite a while and today I came across it again. It is just an overhead shot through a skylight (I was experimenting taking the same shots of harsh lighting contrasts with and without a flash).
When one looks more closely, the image changes – suddenly one sees an ottoman, made out of beige and blue suede, sitting on a black floor. Why and how that happens one can read up on here: Figure-Ground (perception).
So I managed to create an optical illusion.
That’s another first in my life.