Method One

The ability of the human brain to synthesize a three dimensional scene from a flat stereogram is awe-inspiring. But it takes most people some time to learn how to see the three dimensional scene "hidden" in stereograms.

To view a stereogram, deliberately put your eyes out of focus. Focus at a point well beyond the stereogram. Slowly move closer to and further away from the stereogram. Allow plenty of time - eventually you will perceive a subtle depth to the scene. Finally you will see the foreground plainly visible floating above the background.

Don't settle for just a vague appearance of depth. When viewed properly, the foreground will leap up from the background. Once this happens you will be able to see each part of the raised foreground. Once you begin to properly see the image, it will continue to get clearer.

The most important thing is to relax and give it time. After some practice stereogram viewing gets much easier.

Method Two (Using Convergence Marks)

The convergence marks are the two black circles on the bottom of the stereogram.

"By blinking (or covering) the eyes alternately, you can make the marks produce four images, two with the right eye and two with the left. Now deconverge your vision so that all four images can be seen with both eyes open. The aim is to move the two pairs of images closer together until the inner two coincide and only three distinct marks are seen. The center mark is binocular, while the outer two are seen monocularly (with only one eye each). Fixate on the center mark to stabilize the image, then carefully allow your gaze to wander around the whole picture."