And as far as sight—that is, how absolutely solid everything looks—remember that we are dealing with an atomic world so small that you need highly sophisticated microscopes to see it. So it’s not a stretch to imagine how non-solid clouds of energy, which have magnetic forces to hold them together, can be packed so incredibly close together so as to seem like one solid object (like a human body or a rock), but in reality be nothing more than a very convincing illusion.
