The vibration device 24, wherein {HEAD ~ a change} in the direction of the combined vibration force corresponds to {TAIL ~ a change} in the direction of a simulated motion in the computer simulation 
The vibration device 24 , wherein { HEAD ~ a change } in the direction of the combined vibration force corresponds to { TAIL ~ a change } in the direction of a simulated motion in the computer simulation
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH