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Q u o t e:
Awesome series, but regardless of that giant flying cities that have been torn from the ground haven't been new for a loooong time :P

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Indeed :-)

Flying or floating cities is not a new idea, and we have been presented with quite a few incarnations of this idea in recent years, which I presume is due to special effects and computer graphics becoming more convincing and realistic??? Dalaran is not the first floating city ever imagined, and I am sure it will not be the last one either :-)

Wikipedia has this to say on floating cities:
In science fiction, floating cities are settlements that strictly use buoyancy to remain in the atmosphere of a planet. However the term generally refers to any city that is flying, hovering, or otherwise suspended in the air via any means technological or even magical.
http://en.wikipedia.org/wiki/Floating_city_%28science_fiction%29