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A cylindrical keycap is a type of keycap molding that forms the top of the keycap to a cylinder. Cylindrical keycaps are the most common type found in modern keyboards, with the alternative being flat keycaps. Laptops are tending towards flat keycaps—especially those with "island" or "chiclet" keys—a trend that is encroaching onto the desktop keyboard market as well.
Spherical keycaps were the de facto design for many years up to the early 80s, when the cylindrical design took over with computers such as the Apple Lisa (1983) and the Apple Macintosh (1984).