Like charges repel one another. Each atom is surrounded by a cloud of electrons, and as these electrons move closer and closer together, they repel one another more and more strongly. That's the simple explanation.
If a tree falls in the forest and there is no one there; does it make a sound?
The other is, the oft quoted Biblical. . ....and the Word was made flesh.
As well, a popular zen koan comes to mind: what is sound of one hand clapping?/sigh (a breath-less sigh).
Oh. . .and then there is Shrodinger's Cat. . .and a gazillion more perhaps; but brings the quantum challenges/dilemmas into focus. . .maybe?
I never was much interested in this stuff before, but once I found out from quantum physics a particle could be two places at once that sold me! It's quite fascinating. It's almost as if we truly are living in an illusion.