The Goblin: Magnet Detector

Finder of Hidden Things The Goblin is a performance tool for mentalists, magicians, and experimental artists who work with hidden magnetic props. It allows you to sense when a magnetic object or an object containing a concealed magnet is moved near your phone. The app listens to changes in the phone’s built-in magnetic sensor and responds in real time with subtle haptics or vibration. This is not a proximity scanner, and it does not track people, objects, or locations. A magnet sitting still may produce little response. Movement creates change, and change is what the Goblin reacts to. Designed for live performance, the Goblin behaves more like a living creature than a simple meter. It learns the room’s background magnetism, filters environmental noise, and reacts only when something genuinely changes. This keeps behaviour stable in real-world venues such as theatres, bars, homes, and…