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Honestly, I don't think some sort of visible light extending upward is all that bad an idea.
You want to get super hi-tech? Get rid of the uprights completely. Just a bottom bar that projects a red field straight up, equipped with the technology used by police radar... if the field is interrupted, it's good.
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I was thinking of the immortal words of Socrates, who said, 'I drank what?'”
West Houston Mike
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