I’m old enough that I grew up looking at stuff displayed on a table top overhead projector that had a bulb, a loud fan and a glass surface that you put a clear plastic page over to write on, or later, that had been run through a copier or printer. It was clunky, difficult to transport and set-up, and the rendition of your material was subject to some distortion. Still, it got the job done. So here is my salute to these days gone by.