Modeled this guy up just now. It's one I've been meaning to do for a while. I'm not 100% happy with it yet but it's pretty close. The plan is to 3d print it, wire up a circuit with LEDs and a microcontroller to get the blink pattern right, and if I feel ambitious, wire a compass to the circuit so that it'll detect north, and blink when it's facing north. This will let you stand south of a person and pretend it's detecting that person as you turn towards them.
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