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