A real-life "Harry Potter Magical Diaries": the words you write disappear on their own, and AI even talks to you stroke by stroke on the paper.

According to CoinWorld, developer Maxime Rivest has open-sourced a project called Riddle, which recreates the screenless, skeuomorphic interaction of Tom Riddle's diary from Harry Potter on the Remarkable Paper Pro e-ink tablet. Users write questions on the paper with a stylus; the writing automatically fades away after the user stops writing. A large model then recognizes the image and streams the content back. The device dynamically writes out the reply in handwriting stroke by stroke, which then fades again after the user reads it. To achieve smooth "air handwriting" animations and reduce latency on the e-ink screen, Riddle implemented underlying system takeover and software modifications. The project has currently only been tested on specific versions of the Remarkable Paper Pro system. Running it requires root access and involves driver takeover; improper operation may damage the device system.