There aren't any apples in reality. There are, arguably, atoms, and let's stop there and not go further to quantum states, elementary particles, virtual particles, etc. We can allow for the sake of the argument that there are atoms. But there certainly aren't any apples in reality. There're lots of atoms everywhere, and some of them are bunched together in a somewhat different way than some other ones, and the boundary between them is inherently fuzzy. Apples exist in your mind.

Discreteness on a micro level is arguable, but irrelevant to your everyday perception; discreteness on a macro level only exists in your mind. Out there in reality, there are just atoms.