There are two ways to view 3D images: parallel and cross-eyed. This page has some nice images[1]. What you're describing is the cross-eyed way. The parallel wa

There are two ways to view 3D images: parallel and cross-eyed. This page has some nice images[1]. What you're describing is the cross-eyed way. The parallel way has the disadvantage that the separation between the two images can't be too big (no more than about 5 cm at arms length is my guess), while cross-eyed images can have very large separation (e.g. two side-by-side images[2]). In return, once you learn how to put your eyes into parallel mode, it's incredibly easy and quick to do so compared to cross-eyed viewing, and much much less taxing on your eyes (since they are pointing in only slightly unnatural angles), and with more easily discernable details. (also, if you try to view an image with the opposite viewing method it was designed for, it'll come out with the depth inversed, e.g. the raptor image linked by another poster[3] should stand out, rather than look "punched-in") [1]: http://www.vision3d.com/3views.html http://www.vision3d.com/3views.html [2]: http://farm3.staticflickr.com/2073/1620326328_6dc93774bc_z.jpg http://farm3.staticflickr.com/2073/1620326328_6dc93774bc_z.j... [3]: http://img715.imageshack.us/img715/5069/diansor.jpg http://img715.imageshack.us/img715/5069/diansor.jpg