Autostereogram

Autostereograms reduce spatial acuity by a lot. Not good for viewing thin or precise objects.

I don't get what the caption means by "clear the blurriness". The way I did it is that once I had crossed my eyes to see approximately 3 dots, I started moving my eyes up and down across the image (about 2 seconds to go from one end to the other) while still maintaining the same amount of cross-eyed-ness. After ten or so movements the 3D effect emerged. Once the effect emerged my eyes instinctively crossed themselves as necessary to make it sharper, so I didn't have to try very hard to maintain it.

It may help to move your head up and down instead of your eyes so that the parallax effect of floating above the field of horizontal furrows is strengthened.

It's pretty hard to explain. One day you're sure everyone's fooling you and there's no 3D, and then bam, you find the trick.

From the explanations I heard, you have to focus to the double distance between you and the picture, and let your eyes wander.

First time I saw one, when it became a big hit, it was pictures framed in the street. The guy said to focus on my reflection on the glass of the frame, and then try to blur a little.

It worked pretty quick.

So may be you can try something like that, in the réflexion of your screen ?

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.

The first one is the hardest on that page.

Also, try zooming in a lot (Ctrl-scrollwheel in most browsers), as I found them to be too small on my monitor to do comfortably at the default zoom.

Can you get other autostereograms to work? That particular one took me a while to get focused even though every thing else on the page came quite easily.