The invention presents advantages over traditional double stacking in aspects of projector alignment, content copy protection, {TAIL ~ banding artefacts} and {HEAD ~ equipment costs} 
The invention presents advantages over traditional double stacking in aspects of projector alignment , content copy protection , { TAIL ~ banding artefacts } and { HEAD ~ equipment costs }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD