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[-] Carl@hexbear.net 21 points 3 days ago* (last edited 3 days ago)

In the interwar period in Britain, they made these giant concrete parabola "acoustic mirrors" that reflected ambient sound towards one spot, and a person's job would be to sit at that spot and listen for planes and zeppelins. We should bring that back.

this post was submitted on 19 Mar 2026
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