6 Degrees of Freedom controller device made by Spacetec (now owned by crappy computer speaker mfgr Labtec). The Spaceball consists of a big rubber ball firmly attached to a pedestal. Strain gauges in the base detect forces imparted to the ball in much the same way as a trackpoint mouse. Applying force laterally or rotationally to the ball causes whatever object that is being manipulated on the computer screen to be translated or rotated. Sadly, this is a fairly defunct form of 3D input device.