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Have any of you read William Gibson's short story 'The Gernsback Continuum'. It's a while since I looked at it but it seems to suggest that people visualise 'UFO's that they've apparantly seen in relation to the technology of their time and place. For example he mentions a guy from an early part of the century describing what looked like a giant 'paddle steamer'.
The popular rise since the 50s of aerodynamic design makes the 'cigar' shape, or the disc, all the more likely. Because WE think of those things as futuristic, that's the technology we envisage other life-forms using.
Anyway, can't remember the details but an interesting short story.
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