Super cool. I'd heard about how they work but I'd never seen one dismantled like that.
There's a modern toy with vaguely similar tech called Bitzee. My daughter has one, it's a little flip-top box with a virtual pet floating in the middle. But when you look from the side you can see it's a vibrating strip with a single row of LEDs. You can even touch the image to interact with it and stop the moving display.