Here’s a simultation of a mechanical metronome. At first this was supposed to be an implementation of the Rosetta Code task, “Metronome” : http://rosettacode.org/wiki/Metronome. Along the way though I decided to implement the view function using SVG graphics alongside the collage based graphics. The code for both remains in place and might be a good reference for someone interested in SVG.
The tick/tock sound is a wooden spatula knocking against a cutting board.