Electronic devices can also "perceive" sound. Every phone and tablet has at least one microphone, as do most cameras. Any device or space can be equipped with microphones at minimal expense. Indeed, machines can not only "listen"; they have potential advantages over humans as listening devices, in that they can communicate and coordinate their experiences in ways that biological systems simply cannot. Collections of devices that can sense sound and communicate with each other could instantiate a single electronic entity that far surpasses humans in its ability to record and process information from sound. 
