In the scientific community, we talk about how different foundational principles or axioms change the heuristics of physics and that is what this article was about. Convention A leads to Riemannian coordinates and the big bang. Convention B leads to Cartesian coordinates and tired light. There is nothing mystical about Cartesian logic. It was reborn during the enlightenment. When people try to think in Cartesian ways about Riemannian theories, as most people tend to do, trouble arises.