if at first you don't see anything, try making it full screen!
And then you should notice some movement/rotations. Look around, and find out where that rotation is!
I had to edit the code and change scale from 90 to 300 to see it easily in full screen landscape on my phone. I have presbyopia and often need reading glasses to see small things.
This is incredible. One of the most shocking optical illusions I've seen.
Well that's both unsettling and informative. It would explain why I seem to be a better gamer on a good sized monitor unlike the oversized one I have now. (I am ignoring the aging factor here, deliberately. Denial isn't only in Egypt.