As described below {HEAD ~ the outer surfaces} of the panels 16 serve as {TAIL ~ image projection surfaces} 
serve as
As described below { HEAD ~ the outer surfaces } of the panels 16 serve as { TAIL ~ image projection surfaces }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL