The coolest augmented reality setup is UCDavis Augmented Reality Sandbox, which uses a projector, an Xbox kinect, and sandbox that lets you wiggle your fingers

The coolest augmented reality setup is UCDavis Augmented Reality Sandbox, which uses a projector, an Xbox kinect, and sandbox that lets you wiggle your fingers to create rain, dig rivers and lakes, and see how water flows through an environment. My kids and I were blown away by it at a science festival last year. It's all open source and you could build your own for less than $500 I think: https://arsandbox.ucdavis.edu/ https://arsandbox.ucdavis.edu/