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 http://www.technofrolics.com/video.html [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