People take statically stable locomotion for granted.
It is arguably the most prevelant form of transportation yet has almost no general framework for basic research. In some of these examples, the duality between manipulation and locomotion becomes apparent. In other words, a different way to view a person walking on a globe is say the person is manipulating the globe with his feet. The only important point is that the two objects are moving relative to each other. The second one is done today by people without consciously thinking about it.