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I have had a burning question about these since forever. Why do e.g. the Magic Eye books use divergent, not convergent (i.e. crossed-eyes) types? I find it much easier to control position and focal length when crossing my eyes. I wonder about others' experiences.

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That's my experience. I have to trick my eyes to see it in 'divergent' mode. But all I have to do is cross my eyes and I can see the image. Although, I would see shapes sinking into the page not popping out.

Divergent mode is much easier for me. I just unfocus my eyes (the same muscle that blurs them).

I can easily diverge, but I then can't control focus. Do you see the stereograms in focus?

This can be practiced! I was super into stereograms years back and have decent control now (not intentionally but happened naturally). Can slightly diverge to see smaller/far-away images or maximally diverge for the bigger/close-up images.

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