Hachi's Infinite M1 is an AI-powered projector that can throw a working interface onto the desk or wall in front of it. Its maker originally launched it at CES 2020, and is now prepared to ship it from Amazon or its own website. It works thanks to a Snapdragon SoC and a version of Android 9.0.
https://www.notebookcheck.net/The-Hachi-Infinite-M1-is-a-projector-that-turns-any-surface-into-a-touchscreen-and-is-now-available-on-Amazon.490456.0.html
Wow, from the image they've even solved the problem of the projection being blocked by the user's hand. Definitely a company that's all about integrity.
It definitely looks like a great product but I would have to try it out before I make a move to order 100s of them for schools I work for.