What unusual electives would you want to take at a music summer camp?

Good morning ling lings! If you could take a small practice break I could really use your input. This summer I'm teaching at a music camp and boss lady has asked all the teachers to suggest ideas for off-the-wall elective classes we could teach. We already have the standard choices like chamber music, choir, musicianship and some cool ones like koto and mariachi.

This would be 1hr a day for a 2 week session for students age 9-14 with experience playing an orchestral instrument. One idea I have is a basic physics of music class where we record our instruments and learn about amplitude and Hertz and overtones etc. Another suggestion was a class where you listen to impressionist music and paint what you hear. So these classes can be pretty experimental.

What would you (or younger you) be interested in learning about?

Halp!