University of Iowa undergraduate students have designed and built an augmented-reality sandbox — dubbed Gravbox — that helps users visualize how variations in gravity can affect moving objects.

Though similar augmented-reality (AR) sandboxes exist in both geology and engineering, Gravbox is the first to simulate the influence of gravity in real time.

To use Gravbox, one first sculpts an environment out sand, then a computer program projects a moving particle onto the terrain.

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