Still not seeing it? Try to train your eyes this way:
1. Choose an object in the room you’re in – a photograph on the wall or a potted plant on a table in the corner.
2. Pick up the stereogram and look at the object that you’ve selected. Move the stereogram up from underneath the object until it’s blocking your view of the object.
3. Continue to look at the object and not the stereogram, even when the stereogram is blocking it. This means that your eyes will remain focused on the object instead and won’t readjust on the stereogram.
4. Once you’re able to keep your focus on the object and not the stereogram, try repeating this at different distances away from the object.
5. There should be a sweet spot in which you can begin to see the blurry three-dimensional picture within the stereogram when you raise it to your eyes. Once you can see this, try holding the stereogram up while allowing your eyes to slowly adjust. The image should snap into place and become recognizable.
6. If you lose focus, stay where you are and lower the stereogram, focusing again on the object behind it. And try again.