Balthazar Korab, quoted in a new book by John Comazzi, found that Eero Saarinen and Associates’ Deere and Company Headquarters from 1966 “was the most challenging of Saarinen’s buildings to photograph because the darkness and texture of the Cor-Ten steel creates difficult light and shadow conditions. For me it was a project of discovery—I had to discover the architecture over time.”  Photo 1 of 1 in Balthazar Korab: Architect of Photography