A Kinect V2 sensor off eBay, the cheapest projector off Amazon, a frame welded from junk yard scrap, and hours of engaging visual art.
I purchased a used Kinect V2 sensor (for PC, not the gaming console) from eBay and bought the cheapest projector off Amazon. Using the Processing libraries for Kinect and Microsoft's developer kit I made a series of 12 interactive projections. My goal was to bring this to Burning Man in 2019 so I was focused on creating an installation that could be moved easily in small parts, but still withstand the extreme conditions of being in a desert for a week. At Burning Man it performed well, but needed to be turned on only after it was sufficiently cool at night; even with three cooling fans running in the projector enclosure things would start to overheat. Each interactive projection would run for 100 seconds, then move on to the next thanks to a batch program I wrote. The installation is currently in my classroom, where I teach physics, engineering, and computer science to high schoolers. Unfortunately the computer with all the programming was stolen during a burglary, so it is inactive at the moment. Microsoft is quickly deprecating all support for the sensor, so it may be done for good.