If I were a hair stylist, this would be like the invention of a comb. If I were a doctor, this would be like bringing in anesthetics. If I were an olympian this would be my gold medal.
I just put a piece of paper under there and the kids see a giant monster of an image. I put an object under there that I don't want to pass around, BAM, it's on the wall enlarged for all to enjoy simultaneously.
I love my doc cam more than I love my students.