howtodothat
Same question. Also, the layers appear to be composed of the HTML elements. AKA linked images are image layered, then link, then whatever. It's like a 3D representation of the composition of the HTML on the page if you want in in a more complex manner.
Edit: Right Click > Press Q > Bottom Right, click 3D (M)
I just discovered Badspot couldn't completely remove the titles under our avatars. He moved them under our avatars, blank. Wouldn't have noticed it in simple HTML code, the 3D view actually pointed it out to me as green bars under avatars.