Back to the Future: Slides Before PowerPoint

The flip side is overheads, which have almost disappeared. Including hand-written overheads, with lots of different colors, shaky font, and text that turns to the side when the author runs out of space. I saw once a presenter give an entire one hour talk with a single overhead, where all of the equations were crammed together.

I'm old enough that I used drawing tools on a NeXT to compose each overhead, and print it out onto transparencies for presentation.

So the bar may have gone down with respect to slides, but it's gone if you consider that current "slides" have replaced overheads.

3D barcharts have a longer history than I thought!