because it was.
On a Carousel was created in 1967.
according tot he Wikipedia article, The first carousel slide projector was invented by Louis Misuraca, who immigrated to the United States from Naples, Italy when he was a child. Louis was paid a one-time fee for his invention by the Eastman Kodak Company and did not earn royalties. He used the money to take his family on a trip to Italy.
The setting of Carousel takes place a small town in Maine in 1873. It opens at the town's Carousel.
Flying Horses Carousel was created in 1876.
Antique Carousel was created in 1906.
Carousel Man was created in 1973.
Columbia Carousel was created in 1976.
Carousel Theater was created in 1958.
The Haunted Carousel happened in 2003.
Carousel Mall was created in 1972.
A Carousel for Missoula was created in 1995.