 Post @-@ production was severely delayed when Gilliam disagreed with the Weinsteins over the final cut privilege . In the meantime , the conflict lasted so long that Gilliam had enough time to shoot another feature film , <unk> . To create the visual effects , Gilliam awarded the shots to Peerless Camera , the London @-@ based effects studio he founded in the late @-@ 1970s with visual effects supervisor Kent Houston . However , two months into filming , Houston said that Peerless " ran into a number of major issues with The Brothers Grimm and with the Weinstein Brothers " . He continued that " the main problem was the fact that the number of effects shots had dramatically increased , mainly because of issues that arose during shooting with the physical effects . " Meanwhile , the Queen 's chamber inside the tower was actually built by the Art Department as 2 sets . One set was resplendent and new while the other was old and decrepit . The sets were joined to each other by the central mirror , a piece of transparent glass giving the illusion that a single set was reflected and used to create the effect . 
