>>510921926
Quantum mechanics does not follow classical logic or human intuition. It is possible for a particle to be in multiple places at once, and for these multiple-positions to interfere with each other as if it's another particle. This is a brute fact at this point, and that quantum works is the basis for things like the computer you're using. Which path did the electron follow in the image here?

>>510921975
>So is it (e.g.) vertical and also not vertical
Imprecisely, yes.