▁world ’ s ▁first ▁squ ash ▁court ▁with ▁four ▁un ob struct ed ▁one - way ▁vision ▁walls . ▁The ▁one - way ▁effect ▁was ▁created ▁by ▁printing ▁transparent ▁walls ▁with ▁two ▁or ▁more ▁layers ▁of ▁d ots ▁in ▁exact ▁registration ( without ▁any ▁overlap ). ▁Spect ators ▁could ▁see ▁into ▁the ▁ill umin ated ▁court ▁( p ast ▁a ▁layer ▁of ▁black ▁d ots ▁visible ▁from ▁the ▁outside ) ▁but ▁the ▁players ▁cannot ▁see ▁past ▁the ▁white ▁or ▁colored ▁dot ▁patterns ▁which ▁are ▁visible ▁from ▁inside . ▁ ▁Roland ▁Hill , ▁the ▁designer ▁of ▁the ▁Sa fe ▁Screen ▁S qu ash ▁Court , ▁file d ▁the ▁first ▁pat ent ▁for ▁See - through ▁graphics ▁in ▁ 1 9 8 4 , ▁which ▁covered ▁the ▁use ▁of ▁per for ated ▁window ▁films ▁for ▁see - through ▁graphics . ▁The ▁company ▁Cont ra ▁V ision ▁Ltd ▁was ▁launched ▁in ▁ 1 9 8 5 ▁by ▁Hill ▁to ▁commercial ize ▁the ▁various ▁see - through ▁graphics ▁techn ologies ▁and ▁pat ents . ▁A ▁second ▁pat ent ▁for ▁see - through ▁graphics ▁was ▁file d ▁by ▁Hill ▁to ▁cover ▁transl uc ent ▁print ▁patterns , ▁which ▁can ▁be ▁ill umin ated ▁from ▁either ▁side . ▁ ▁The ▁world ' s ▁first ▁" full ▁wrap " ▁bus ▁was ▁completed ▁in ▁New ▁Zealand ▁in ▁ 1 9 9 1 . ▁ ▁A ▁number ▁of ▁compet ing ▁manufact ur ers ▁of ▁Per for ated ▁Window ▁Film ▁entered ▁the ▁market ▁in ▁the ▁ 1 9 9 0 s , ▁including