Here’s a cool do-it-yourself hack. It’s a set of eyes made of pizza boxes you place in your window, the eyes can rotate via servos on the backside, the servos are controlled by a simple motion detector that is also in the window. It all comes together using Linux’ Xeyes applet.
When someone walks or drives by the window, the eyes are ‘aware’ of their presence and will track movement.
More pics and basic info on zedomax’ blog.
The story originated from http://hunz.geekheim.de/?p=47, it has more details.

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