At some distance, when patterns overlap each other, you will notice that something strange is happening to the image. Once you can keep looking through the stereogram, keep moving your head back and force very slowly. If it happens that eyes focus on the image start Step 1 again. Keep looking through the image and moving back from it slowly at the same time. Your eyes naturally will try to refocus back on the stereogram image but you will need to force your eyes not to do so. Then start to move back from the stereogram very slowly. Don't tilt your head and try not to blink.

Always hold stereogram horizontally, do not turn and do not bend it. Of course you won't be able to see anything yet because image is too close to the eyes. Try to look through the image, pretending it doesn't exist. There are different methods to learn seeing stereograms, one or another may work out better for you, though all will require some patience. When you have been able to see one, you can stop looking for more and more, it becomes obsessive!

“Disparency” in views will make your brain see hidden 3D image.

This will make pattern tiles to overlap each other and each eye will be seeing slightly different image. The picture becomes blurry and doubled and that’s exactly what we want. And it's not just a play of imagination, the hidden image is very realistic! Basically you need to “unfocus” your eyes and look through the stereogram. At first look a stereogram is similar to nothing more but a tiled pattern, however, with a proper look you can discover amazing 3D image hidden inside.

3d stereogram books