Kelly Harris asks us: “Which way does the window face”? Let’s see! Umm… Not as simple as I thought it would be. The principle of this Escher like, impossible object is same as with bidirectional face and safe doors illusion. This is old school illusion, as you see. I kinda like them more. Kelly also writes: “I’ve spent two weeks at work going through all of your illusions – very interesting. Found this at another site but unsure where. I hadn’t seen it in your collection”. By the way, just found out that the author behind this is Sandro Del Prete.