Speaking of 3D, check out:
http://www.3dphoto.net/index.html
Partway down the right side under "Resources" is "How to View". I fooled
around with this a couple of weeks ago one night. I can do it, but it takes
a lot of effort/practice. (And I've always been able to cross eyes, then
individually swivel each to be looking out instead of in.)
Just haven't gotten back there to waste more time . . .
<g>