Let's pretend we're explorers in a future land of a distant planet. In the sand of this planet, we find a clothespin... Now, let's imagine that we don't know what the hell a clothespin is (I know it's absurd, we just landed on a planet and we don't know what a clothespin is, but let's imagine ...). So we find it and studying it, we notice that it consists of three parts equally necessary to make it work, if one of the shovels or the spring were lost, it would cease to function as a clothespin.

Now, everyone should think: “Mmm, interesting, what a curious gadget that has accidentally appeared here, the wind must have blown, or something, and has symmetrically chiselled these pieces of wood by positioning them exactly on each side. Then he has blown even stronger and threw an iron from somewhere by twisting it and forming it in such a way that it fit precisely between those two pieces of wood, also adding a desired tension to join them and BOOM, there we have the clothespin. "

Right?