Japanese War Tubas. I repeat, Japanese War Tubas:

Seen on this page. The war tubas look like a musical instrument (some kind of Dadaist/Futurist sound-art device, or perhaps a super-loud military-band instrument designed to strike terror into the hearts of enemies, much as bagpipes were), but they were actually devices for acoustically locating incoming aircraft. I wouldn't be surprised if the photograph in question has graced at least one CD of experimental music/noise-art.

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