if something causes something else to change, then that something affects that something else
sometimes_change is not good_thing. change is not thing. change_of_device_state is not unnatural_thing. sometimes_change is good_thing. change is when_one_thing_becomes_another_thing. difference is change. change is thing. all_things has impact_on_other_things change is not when_one_thing_becomes_another_thing. change is happening.