We used a serial-to-USB converter to be able to upload images to the computers, each of which has enough space for four different images, allowing us to create animations or just to display a rotating set of images.
For my first go, I tried a portrait of Carl Sagan. Because we only have one color, I had to find a simple portrait that was easy to reduce to a single color. I found this one on Google Images, and turned it into this.
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