I'm going a bit off topic here but this two bars technique is the most powerful 3D-without-3D-hardware effect I've seen, short of Magic-Eye. https://imgur.com/

I'm going a bit off topic here but this two bars technique is the most powerful 3D-without-3D-hardware effect I've seen, short of Magic-Eye. https://imgur.com/gallery/HQGog https://imgur.com/gallery/HQGog