I built this Head BEAMbot a while back. It has two photocells (shaded with the blue straws) that sense light. The robot is mounted on top of a motor, and spins itself around to find a position where it can get equal amounts of light hitting each photocell. Devices such as this would be used as the "evil sensors," detecting light and motion for the "deep listening" device.
Here is a short clip of it in action:
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