The projectors and the cameras may be electronically connected to {TAIL ~ a computer processor} which controls {HEAD ~ their operation} 
The projectors and the cameras may be electronically connected to { TAIL ~ a computer processor } which controls { HEAD ~ their operation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD