if something is used for a process, then that something visibility that 1
visibility is clearness. used_thing is artifact. visual_range is visibility. aeroplane_used_for_surveyings is tangible_thing. artifact_used_for_communication is piece_of_technology. communications_system is artifact_used_for_communication. visibility is not clearness. database_searching is use_of_device. artifact_used_for_communication is not piece_of_technology. marking is visual_information_source.