SandScape

Sandscapes is addictive simulated tangible interface designed to help users understand landscapes through a projected surface of sand. Simulations range from height, slopes, contours, shadows, drainage, and also has the ability to interact with physical models such as buildings cars or whatever else you program into it.

I've played around with Sandscapes and its pure joy. Swing by the MIT MediaLab when you have the chance to check out their other great projects!

MIT MediaLab(Tangible Media Group)
SandScapes