Do Self-Contradictory Entities Exist?

There are definitely limits to publicly known knowledge about physics. Why shouldn't there be other phenomena besides energy, information, and matter? For example, in the last century, there were still assumptions about an ether. Whatever that might consist of. The idea isn't even far-fetched. P.S.: I don't want to defend the idea of ​​spirituality, but merely point out a weak point in your argument.