The moment when desktop publishing was introduced to the workplace. Shortly after graduating college, I was employed the layout department at Fosters Daily Democrat in Dover, NH. We used onion skin, stock image books that we had the stat camera staff  reproduce at the appropriate sizes, wax paste-up, border tape, and rubylith film for cutting color. All type had been speccedand printed out from linotype machines.
Then one day, the owner of the company presented my department with Macintosh SE machines.