Everything Doesn't Really Exist

At least in the sense that we tend to think it does.

This is probably the one reality that is most counter-intuitive, yet something we live with all the time. It is the big illusion that is reality itself. All matter is really just empty space (99.999999999% empty space). If so, we should be able to walk through walls, but thanks to the electromagnetic forces in our body and the wall, we're repelled from being able to walk right through. So were it not for a kind of magnetic force, we would be able to walk right through the wall, or fall right through the chair for that matter.

Oh, and the food we eat, there's very little of it there either, it's mainly just some electricity that we digest.