This is a demonstration of an augmented reality sandbox with real-time topographic line generation. Basically the system automatically adjusts the topography lines and color depending on the altitude of the sand in a particular area. I could play with that for hours. Or at least a couple minutes. *builds up island* Dammit villagers, I demand a sacrifice or I will sink you to the bottom of the sea! Somebody, anybody -- jump in this volcano. I'm waiting. That's it! *destroys island with a sweep of an arm* Wow, that was actually pretty fun. And look -- there was treasure buried under the island! "Pretty sure that's a cat turd." This is why I hate sandboxes.
Keep going for the video.
Thanks to Dean D, who's confident there's an application for this in augmented reality p0rn.