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In December I received and mounted the Moore Pattern Kinetic Sculpture that Jeff Lieberman designed (from a KickStarter sponsorship).
Although the motor is very quiet, I used an X10 module and motion sensor to only activate the sculpture for a couple of minutes when people approach. I used the X-10 MS16A sensor (for about $15). These later generation X10 motion sensors are nice in that they have a programmable internal timer and can send the off signal after a delay if the motion sensor hasn't re-tripped (with some of my earlier motion sensors I had to build that logic into the control system rules).