A wall, for example, is not a wall. It is the result of the interation of Matter and Prime Vibrational energies in a particular way. This is the least well understood of the Vibrations. While it is a little mystical for the tastes of the Etherians, they feel it better to explore it anyway rather than let it stop them cold as it would the Conventions. Those criticizing Keplerianism say that Vibration 0 is a logical impossibility.
Proponents say that it is like a mathmatical convenience, only more.
While other Vibrations do not require the addition of Zero, experimental evidence has shown a statistical correlation between adding Zero and the generation of some effects. In the same way, you can subtract Zero to change or impede Interactions. Which Is Not. An early Keplarian hit upon the idea of using electricity. While not perfect, this method works as well as any.