Today’s homes are full of wireless devices, all emitting their own fields. The composite field changes as objects move around, but the key to invention was the ability to identify distinguishing patterns for different forms of motion. Lifeless matter disrupts the field rigidly, and living things have their own set of idiosyncrasies. By filtering out known disruptions, spectral analysis can then be used to identify unwanted interruptions, like burglars. Aura, a product available from Cognitive Systems, consists of a hub that looks like a Kleenex cube and a wall sensor that looks like a plug-in air freshener to monitor a home’s ambient field. It surveys and performs spectral analysis on a bandwidth between 680 and 4,000 megahertz, which covers most home wireless devices, within a range of 2,500 feet. Any action by an unrecognized human will trigger an alert sent to the user’s phone via app. Aura does not require visible light like motion sensors, and it covers places people don’t want cameras, like bathrooms.