What I find incredible is that this was done with film without modern tools such as those light meters and a preview mask on an LCD screen. They had to do a te

What I find incredible is that this was done with film without modern tools such as those light meters and a preview mask on an LCD screen. They had to do a test and then process the film for each adjustment. A extremely tedious process and that doesn't include the work that was required to produce that prism.