My dad found some old photos in slide form (more on that later) and decided to go through them. To do that, he employed this contraption, at right.

It was insightfully pointed out to me that, before slideshows were made with PowerPoint, they were made with physical slides that were shown by a special machine like this one. This particular machine is older than I am and it still works. (Here the word "works" is applied... generously.)

Needless to say, I'll be scanning all of the slides into digital form as soon as possible.