[ExI] Silence in the sky—but why?

[TwentFirstCentury Matters]

What do you visualise when you think of extraterrestrials? Immediately I think of a Portuguese Man Of War
type colonial, in reaction to the automatic presumption by so many that an ET would be Earthlike.
 
At any rate, bilateral symmetry is not what first comes to mind-- appears too pat IMO.
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