So..... this is what goes on in a Mathematican's Head.

All works from Escher. What he is known for is his use of perspectives to create 3D images on 2D platforms.
He is also known to draw seemingly, 'mind-bending'/ paradoxical images. He was a mathematician as well as an artist. Pretty cool eh?

Try to follow the path from the highest level. Get the picture?
I think you could stare at it all day long and not get bored.
And lastly, his most famous work................

"Ascending and Descending"
Also featured in the movie, "Inception".
If you don't get the paradox, look at the highest level of the castle.
Yeah... now you see it.
Alright, have fun staring... ciao!