Quote:
Originally Posted by Don098
Are the iron workers able to continue work when they're in the clouds like that? It must be like working in dense fog...I'd hate to have thousand-pound iron beams swinging around while trying to keep my balance up there. Yikes. 
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The tower is obscured by fog because it's viewed from a distance. When you are in the middle of that fog, you can see perfectly clearly. My guess is the ironworkers only need maybe 10-20 meters of visibility to work in reasonable safety, and that picture was taken from at least a half-km away. I'm guessing the limit here is not set by the ironworkers but by the crane operators, who need to be able to see for a much longer distance.