You must make the image large on your computer monitor. Then you cross your eyes until two similar parts of the image coincide. Then allow your eyes to focus while still keeping them crossed. This will easily allow you to see something, although the depth will be reversed. In other words, the one I looked at to check out looked like a flat area of colored stars with areas cut out and sunk in. They are usually fairly simple shapes. You're not going to see a photograph of something else.