The document describes heARty, a demonstrator combining the Internet of Things and augmented reality. It uses an inexpensive "magic mirror" and pulse sensor to display a 3D model of the user's heart overlaid on their chest, beating in real-time sync with their actual heart rate. This allows users to visualize and learn about biological data spatially registered to their own body. Potential applications include improving self-care and medical training by making heart function and biometrics more engaging and understandable for both the general public and medical professionals.