This sandbox projection at the University of California at Davis looks like a fun toy, but it's also a useful simulation for teaching people about geology:
The resulting augmented reality (AR) sandbox allows users to create topography models by shaping real sand, which is then augmented in real time by an elevation color map, topographic contour lines, and simulated water. The system teaches geographic, geologic, and hydrologic concepts such as how to read a topography map, the meaning of contour lines, watersheds, catchment areas, levees, etc.
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That is trippy and amazing.
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