if something is formed by something else, then that something else is required by that something
another_way_to_say_separates_things is divides_objects. thing is substance. separated_thing is divided_thing. else is river. change is when_one_thing_becomes_another_thing. space is what_between_else. element is substance. puttingsomethingintosomethingpartway is putting_into_else. creating_from_raw_materials is creation. planting is putting_into_else.