As a not quite middle aged dude, I only just now figured out how to see magic eye stuff. I tried a couple times in elementary school but didn’t get it so I stopped. Had a few drinks earlier, stumbled on some magic eye pic that I could see clear as day and it blew my mind a little
Oh that one is a good one, it’s very busy. Using the first method the trees are on the ‘bottom’ and everything progressively pops out with the fish/turtle on ‘top’.
The other way is reverse, the trees are on the ‘top’ and the fish are on the ‘bottom’ (like I’m looking in that ‘box’). It’s also really hard to see the whole picture this way, but that’s just me.
Also, ‘In a Box’ might not be the best analogy, you can make one that intentionally feels like you’re looking inside something – it’s just that most of these are made to pop out at you.