jigsaw puzzle
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jigsaw puzzle, any set of varied, irregularly shaped pieces that, when properly assembled, form a picture or map. The puzzle is so named because the picture, originally attached to wood and later to paperboard, was cut into its pieces with a jigsaw, which cuts intricate lines and curves. Jigsaw puzzles may be very complicated vis-à-vis the number of pieces and the number of different cuts and thus take many hours to complete.
The puzzles originated as educational devices to teach geography (dissected maps) in 18th-century England. Dissected pictures followed, covering such subjects as history, alphabets, botany, and zoology. The use of popular pictures began in the 1860s and ’70s, in both Great Britain and the United States. The puzzles became extremely popular in the early 1900s and had a revival in the Great Depression of the 1930s as an inexpensive, reusable amusement. Another revival began after World War II, and jigsaw puzzles have remained a popular entertainment since then.