Homage 2 Escher

Yes. That is a photograph.

What is it?
This time, I'll let you try and guess.
It's not easy, and there is no added graphics or manipulation.
The only thing i did was to mirror it 4 times.

OK, many of you knew it.
It's a pattern on a marble floor.
The reason i thought it would be harder, is that i never saw a pattern like that before, and since it was my only time, i thought it would be new for you too, but i was wrong.

I submit this as a homage to the great M.C. Escher

G