To find out which properties have a chance to survive in future more fundamental theories, we consider different examples of changes from fundamental theories to approximations. Not surprising at all is the observation that space and time are more stable than the configuration space, which is more stable than the laws of evolution. This holds for the corresponding symmetry groups too. The consideration of a sound analogon of Lorentz symmetry suggests that a global symmetry which becomes localized in a more fundamental theory is doomed to disappear in the next more fundamental theory. This contradicts common opinions about local Lorentz- and gauge symmetries as well as quantum randomness having a deep fundamental character.
Ilja Schmelzer