Found this kinetic sculpture the other day by Christian Werdin that I thought was really cool, called Three Scribes:

Embedded in this Boingboing post about it is another video which shows for a few seconds at the end the mechanisms under the table, which I’d like to find in more detail, personally.

Here’s a longer piece about Werdin, but it’s only in German unfortunately (for me). You can at least see some of his work and workshop if, like me, you don’t speak the language.