8 Scientific Theories That Totally Change Captain America: Civil War
4. Vision
Fulfilling the role of Overly Literal Character enjoyed by the likes of Data and satirised by Drax, Vision is one of those massively overpowered characters that is just too noble to use his abilities to grind you into the floor.
Vision's powers mainly seem to extend from his ability to manipulate matter on an atomic level, which could go some way to explaining one of his creepier quirks - the whole walking through walls thing.
Normal objects at a normal scale cannot usually walk through walls (don't take my word for it, try it now. You have to get a lot of speed up), but there are certain situations in which atoms can travel through seemingly solid barriers. We're in the weird world of quantum physics.
Quantum tunneling is a quantum-mechanical effect in which it is possible for a subatomic particle to actually move from one side of an energy barrier to another without having to actually pass through it. This is because, at the quantum level, a particle's position is described in terms of probability. Granted, there is a very small probability that the particle will tunnel through the barrier, but as that probability is more than zero, there is still a possibility.
It would be beyond the realms of possibility (well, it would, but you know what I mean) that Vision can somehow control these probabilities. This would explain how he is able to fly, disappear and reappear and, yes, walk through walls - he is actually just a big old quantum object.