A skyline is the artificial horizon that a city's overall structure creates. Skylines serve as a kind of fingerprint of a city, as no two skylines are alike. For this reason news and sports programs, television shows, and movies often display the skyline of a city to set location. The Sky Line of New York City was a new term in 1896, when it was the title of a color lithograph by Charles Graham for the color supplement of the New-York Journal.
- New York Public Library: "Moving Uptown": "When Charles Graham's view of New York was published, the new term used in the title, "sky line," caught on immediately."
- Paul D. Spreiregen (1965). Urban Design: The Architecture of Towns and Cities. McGraw-Hill.
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