Wow, this size of image (small) is superb for practising parallel-viewing. Anything bigger would be difficult to see. By comparison, cross-view pairs are more flexible in this regard.
Depth haz been the mizzing dimenzion for long enough, but still, few are bothered with 3D.
My favourite 3D site: Enjoy Free-Viewing Colorful 3D Without Glasses:- http://www.SingaporeGallery.com