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Parts of America are also dotted with giant concrete Christmas-tree icons, but the aviation involved with those is a little less benign.
https://news.ycombinator.com/item?id=6453401
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I like that in old Superman comics he would use one of these giant arrows as a key to the fortress of solitude. Only someone with super strength could gain entry.
At the time I first read a reprint of an old Superman with the aircraft arrow they had probably been obsolete for decades, which like English police boxes just seems to make them more magical.