From their paper: http://tmg-trackr.media.mit.edu/publishedmedia/Papers/527-inFORM%20Dynamic%20Physical%20Affordances/Published/PDF http://tmg-trackr.media.mit.

From their paper: http://tmg-trackr.media.mit.edu/publishedmedia/Papers/527-inFORM%20Dynamic%20Physical%20Affordances/Published/PDF http://tmg-trackr.media.mit.edu/publishedmedia/Papers/527-in... it appears they use 900 motorized slide potentiometers connected to bowden cables. Current prices from mouser suggest that the actuators alone cost $23,000. This isn't a cheap toy, but it does show what we could do if actuators got cheap...