Remember a while back when I linked to the Music Animation Machine videos? These animations visually represented some fairly complicated pieces of music, such as one of my favorites, Mozart's Symphony No. 40, as a series of colored bars scanning across the screen:
I loved the way the structure of the music was made visible; how I felt I could understand and grasp the music in a way I couldn't before.
At the time I posted that it reminded me of something, but I couldn't think what.
Then this morning I saw a website that told me instantly what it was I had been reminded of: Music boxes!
The above movie is from vihart.com, which is a treasure trove of videos about mathematical and musical recreations. I can't recommend it highly enough.
Here's another video from vihart.com, this one about graph theory:
Enjoy! My kids and I all did.