Muzei is a production Android live wallpaper application that rotates artwork from pluggable sources. The main app renders artwork through a custom OpenGL ES wallpaper service, persists artwork metadata in a Room database, and uses WorkManager to fetch and update artwork. Sources are exposed through a ContentProvider contract; built-in sources cover featured art, gallery photos, and a single image, while the muzei-api module provides a public SDK for third-party source apps. A companion Wear OS app syncs artwork via the Play Services data layer and provides watch complications. The repository also contains a Python 2 Google App Engine backend and a static web frontend for the muzei.co featured-art archive and admin scheduling, making the repo a multi-platform product rather than a pure mobile app.