What you can see is always only a small part of what there is, isn't it? For example, "the world" we know is only the few miles above and below the Earth's surface. Most of the Earth is super-hot rock and metal, and above us is the emptiness of space. The only part of the human body we can see for the most part is the skin. The true nature of our bodies, a watery, reddish organic goop, is for the most part hidden from view.

Or the biggest stunner - the fact that everything you can touch is mostly empty space, no matter how solid it seems!

Originally posted by Donnie Darko
Or the biggest stunner - the fact that everything you can touch is mostly empty space, no matter how solid it seems!

they are Just Like Collision detectors in video games where they is mostly empty space except they are real thing

Honestly, in the grand scheme of things,physical existence doesn't mean much. Our actionsmight, but that is a whole other topic.