It's one of the first physical tricks a human child learns: how to stack blocks. It is the way we learn about gravity in an intuitive way, long before we learn about the law of gravity, and its magic number called the gravitational about. I have a feeling this constant is just a sign that we do not know the full truth about gravity just yet, which still allows for anti-gravity to become a technology that is no longer impossible.
SpaceX has taken stacking to a whole new level. This shows how they use stacking in the production process of the Starship, in both stacking with conventional cranes, and with MegaZilla on the launch pad.