All right, light is an abstraction, contracts are abstractions, 10 is an abstraction, time is an abstraction, and I am an abstraction too. The notion is so fuz

All right, light is an abstraction, contracts are abstractions, 10 is an abstraction, time is an abstraction, and I am an abstraction too. The notion is so fuzzy that everything can be an abstraction in a certain way. The word "abstraction" is a black hole for thoughts. Stay away from it. For instance in this threads and in TFA, people made useful distinctions such as "generalization" or "indirection".