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Computer: Display: 3D
Interactive Sandpit   (+1)  [vote for, against]
Kids play on large flat sandpit with computer controlled ferrous sand

The computer would be like a giant sandpit which you could "draw on" by pushing the grains around. It could respond using magnets to shift the sand itself.

Even make the grains with a piezo-electric polymer coating that changes colour for an added dimension!

Only problem is if they put it in their mouth, brings new meaning to user interface...
-- zero5, Aug 06 2001

Technofrolics Dancing Magnetic Iron Dust http://www.technofr.../dust-overview.html
[JesusHChrist, Mar 30 2005]

TF videos
[JesusHChrist, Mar 30 2005]

What happens when Sally and Tommy play "Bury Tommy in the Sand" and then Sally presses the "delete" key?
-- beauxeault, Aug 06 2001

Technofrolics magnetic iron dust is cool (link)
-- JesusHChrist, Mar 30 2005

random, halfbakery