I do it instinctively since I was 5 so it's hard to explain it. If you can use a big monitor it would be easier. Place very near the screen, enough to trick y

I do it instinctively since I was 5 so it's hard to explain it. If you can use a big monitor it would be easier. Place very near the screen, enough to trick your left eye to see the left small eye icon, and the right eye the right icon. You should see it as a single eye. Now slowly move your head back and try to keep relaxed. If you get to do it you should see the illusion of 3D appear on the whole image.