Oh, I spent my whole childhood wondering what the heck those people (dad included) saw in those chaotic swirls. But it wasn't until my teens that I studied the matter more deeply, and I learnt that I had to focus my vision beyond
the painting, and then the vision would slowly adjust to see the 3D image (because, you know, if your eyes focus beyond an object, you'll see that object "doubled", and I think it was the whole point of the thing: in the painting were somehow hidden two slightly different versions/views of the same pic, then each eye would see one of those views, and the brain would elaborate them as an actual 3D object. Ok, enough with the OT.
). ...Who knows, maybe it's truly some sort of kekkei genkai that activates at some point in your life.
Well, your version of the magic is even more fascinating though, since you don't need strange ocular tricks nor headaches in the process of enjoying the picture! ^^ Everything is there from the beginning, but you just can't see it at a first glance... really, it's amazing.
P.S.: no, I haven't seen Kubo yet. As you perfectly know, I wanted to watch it SO much
but of course, being it a different film from the usual stuff you see all the time, it lasted in my local cinema for a ridiculously short time, and I missed it. >_< Trying to find some time to see it home with a couple of friends, but it's not easy to meet, either, since everyone is so busy lately...