For stereo pairs larger than a few inches across, cross-eyed freeviewing is usually easier than the parallel technique. With images made for cross-eyed freeviewing, the right portion of the pair is displayed in the left half, and vice versa.

Here’s an easy way to learn how to freeview cross-eyed when looking at a stereo pair for the first time. You might need to adjust your browser window so that the entire image at the bottom appears on screen.

Look toward the tip of your nose, crossing your eyes significantly, then slowly relax your eye muscles while gazing at the image.

When the stereo pair appears as three images, focus your attention upon the center image.

While the left and right halves remain in your field of view, concentrating on the central image will make it appear three dimensional. Your brain fuses the two halves, creating a single image with depth.

Don't force it. A relaxed approach will soon succeed, and practice makes perfect. Try freeviewing the cross-eyed stereo pair below, which has borders for convenience.