A work is considered the skyscraper if it rise from the surrounding environment and changes the overall skyline. The largest height of the work developed over time, along with the progress on methods and techniques of construction, so that today the skyscrapers are taller than before. The concept of "skyscraper" (skycraper) is a concept of Oceanography vertical mast trees only on the sailboat. The skyscraper is invoking the imagery of high buildings. Although there are clear differences in terms of the definition between tall buildings and skyscrapers, but those works have height less than 30 floors are usually not viewed as skyscraper, while the works from 50 floors up is often viewed as the skyscraper.
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