if something is a public of something else then that something else determines that something
fault is tangible_thing. marking is not tangible_thing. public_fact is not one_everyone_knows. change is when_one_thing_becomes_another_thing. public_fact is one_everyone_knows. matter is tangible_thing. public_square is tangible_thing. living_thing is tangible_thing. change is not when_one_thing_becomes_another_thing. marking is tangible_thing.