Hm. I mean, you're right it's for sure not the same as vision, but it's also reasonable that if people say they can do this sort of thing, even weakly, and othe

Hm. I mean, you're right it's for sure not the same as vision, but it's also reasonable that if people say they can do this sort of thing, even weakly, and others say they can't, there is likely some sort of fundamental difference between them. Regardless of what, exactly, that difference is.