the images are small enough so that
one image fits between your eyes, the stereoscopic image can usually be
viewed without the aid of any viewing device here's how. . .
Hold your head close to the image pair so that your right eye is over
the right image and your left eye is over the left image. If you are wearing
glasses, you may want to remove them.
Look straight ahead and imagine that you are looking at an image which
is far away (gaze through the screen). The stereo images should be fuzzy.
Slowly pull your head away from the screen while maintaining your gaze.
The two images will become four images. Concentrate on a point which is
behind the screen.
Eventually the four images will merge into three images. The center image
should be in stereo. You may need to rotate your head slightly to the
right or left.