As some here may recall, I play with ideas for making pieces that are kinetic and/or dynamic. Kinetic MOVEMENT ONLY, dynamic CHANGES - color and/or sound and maybe movement as well. Thanks to little battery powered, programmable micro-controllers and electronic things you can connect to it that are controlled by it. I can do kinetic and dynamic pieces - that I can give "behaviors".
Here's a link to playing with a pendulum's behavior and some ideas for using that behavior.
charlie b