The open-source Lantern project promises to transform any surface into AR using Raspberry Pi, a laser projector, and Android Things:
Rather than insisting that every object in our home and office be ‘smart’, Lantern imagines a future where projections are used to present ambient information, and relevant UI within everyday objects. Point it at a clock to show your appointments, or point to speaker to display the currently playing song. Unlike a screen, when Lantern’s projections are no longer needed, they simply fade away.