Excellent shots of scary stuff. Really interesting, thanks.
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That was my point, with a touch of irony, how did they build the first crane? 
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Amazing how the whole thing, boom and tower, flex as the load weight varies.
Must be really shaky on a windy day.
I’ve always thought how much I’d love to go up one when it’s a tad breezy.
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Thanks Callum, another of life’s mysteries solved. Now how about Einstein’s Theory of Relatively 
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They couldn’t pay me enough to be up there.
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Masochist!!