Fractal Music Box

I made four of these music boxes as christmas gifts to my family. The PDF pattern was generated with a Processing script, which I wrote. I've included the script for reference, although you only need the PDF to produce copies of the box. Each box is laser cut from a single piece of 12x12 plywood.

Here's a video of my daughter on Christmas: http://youtu.be/n9I88Lt0zUw

The lid of the box contains an inlaid Hilbert curve, a kind of space-filling fractal. A more detailed Hilbert curve is