"Raiders" Boobytrap Question: "stay out of the light"? Any engineers here?

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Posted by Inbanana Jones from spider-wd031.proxy.aol.com on January 29, 2000 at 05:22:02:

How, exactly, does that pointy-spikey thing work?
Is there any reasonable explanation?

All I can figure is that: the wall upon which the light shines is covered with some kind of selenium or photo-sensitive algae, and when interrupted the algae contracts slightly, setting off a hyper-sensitive balance mechanism in the surrounding tunnel, which then shoots out the spikey thing.

Any engineers out there with ideas?

Science-fiction writer Lester Del Ray (I believe) wrote a popular book on "prehistoric technology", but light-sensitive traps weren't addressed. Yeah, it's just a movie, but any ideas???

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