The BFI IMAX theatre on London's Southbank has just been upgraded with a new screen and new projector. It's quite the gargantuan task to replace that 26m by 20m screen, which the BFI's kindly documented in photos for us all to gawk at.

Did you know that the screen has to be sprayed with a fine coating of silver once hung, because a pure white vinyl screen would cause image ghosting? I also didn't realise quite how absolutely enormous the IMAX projectors were -- those things are real monsters.

The BFI put up a whole boat load of photos for your perusal, so it's worth checking out for more from literally behind the scenes. [Imgur, BFI]