☛ Click to cycle through three autostereograms. ☛ Click the green flag to switch between wall-eyed and cross-eyed vergence.
✦ Wall-eyed vergence means that you need to focus your eyes at a point beyond the screen to achieve the right results. ✦ Cross-eyed vergence means that you need to focus your eyes at a certain point in between you and the image to achieve the right results. If you succeed, the image will appear to be three-dimensional. (It may require some training if you haven't tried it before) Learn more here: https://en.wikipedia.org/wiki/Autostereogram