Some years ago, someone asked me how he could stop people touching his car. I said, have a car respond to touch? That is difficult. He said no, before someone touches it. I developed something for my three-wheeler -- a passive visible spectrum alarm. When one parks a car, then, one needs to swivel a sensor towards a light source -- any light source that would be interrupted -- say, a street light. Before anyone touches the car, the alarm triggers. OBSERVATION: It is more than a passive infra-red alarm, in that it is has no range limit, and may be more directional.
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