It is possible, with a little practice, to see sterio without a
viewer. By superimposing the two images by "kinda crossing
your eyes" you can see the sterio effect. This is a useful tech.
to learn if you regularly need to see sterios, no good if you
are demonstrating to a class.
I have used the technique with sterio X-rays, sterio aerial maps,
and sterio protein configurations.
Rick Wood
