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When looking at objects really close its easy to have the eyes out of focus.
A stereogram can be best seen at about 40 cm of your eyes.
How to read a Stereogram: Bring the stereogram image really close to your eyes (until you touch it with your nose). At this distance your eyes cannot focus on the image and they look somewhere behind the image. Now, slowly push the image away from you, while trying to keep the eyes off focus. At some point you will see the hidden image.