A long time ago in a conference room far, far away, speakers used to give their presentations using a slide projector. Before computers were easy to move around, the slide projector was the all-in-one machine used to put graphics on the screen during a presentation. You may have heard of the Kodak Slide Carousel. You may have even used one in a presentation or two. To use the carousel, the graphics the speaker wanted to show during the presentation were made into slides. Those slides were loaded into a wheel and as the wheel advanced, a new slide was projected on the screen.