AKAIK, they made the digital positive because...well, just how does one successfully make a 32'x108' contact print? If you can imagine the enormous amount of effort that it must have taken to make the original negative, I think it's pretty understandable that they made the smaller digital print for display purposes. After all, it's hard enough to find a place big enough to show such a gigantic photo element (the negative)...just where are you going to find the space to display two?