The Optical Illusion of Dimension

I don't have much to say about this work of visual genius, a crazy optically-induced virtual tunnel.

It's simply one of the best, most astounding optical illusions I've ever seen- & I've seen quite a few...

Definitely click for a larger image:

 
A fractal can be plotted on a 2-dimensional surface, but can be "zoomed" into, for a virtual dimension of depth. Similarly, this flat image is crafted to give the appearance of a virtual dimension of depth that can only be perceived by the viewer.