Every year George Eastman House welcomes hundreds of researchers interested in our collections; we host photo historians, curators, students, scientists, and hobbiests from all over the world. Often they are experts in the field and we get to learn a thing or two about our collection. A few weeks ago a former professor of mine was here to look at our collection of Megalethoscope slides. Antonella Pelizzari teaches History of Photography at Hunter College in NYC and is an old friend of Eastman House. She is currently working on a book on Photography and Italy and traveled to Rochester to research and look at our collection of Megalethoscope slides. I was familiar with these delightful objects before Antonella’s visit, but I didn’t realize that we have one of the largest collections of Megalethoscopes in the world. I also learned a bit about how they work and how they are constructed, which I will share here.