Hypocycloid prove that an epicycloid with "k" cusps moves snugly inside one with "k"+1 cusps. The evolute of a hypocycloid is an enlarged version of the hypocycloid itself, while the involute of a hypocycloid is a reduced copy of itself. The pedal of a hypocycloid with pole at the center of the hypocycloid is a rose curve. The isoptic of a hypocycloid is a hypocycloid. Curves similar to hypocyloids can be drawn with the Spirograph toy. Specifically, the Spirograph can draw hypotrochoids and epitrochoids. The Pittsburgh Steelers' logo, which is based on the Steelmark, includes three astroids (hypocycloids of four cusps).
Toy soldier first plastic toy soldiers produced in Great Britain were made in 1946 by Airfix before they became known for their famous model kits range. One large historical producer in plastic was Louis Marx and Company, which produced both realistic soldiers of great detail and also historical collections of plastic men and women, including the "Presidents of the United States" collection, "Warriors of the World", "Generals of World War II", "Jesus and the Apostles", and figures from the Coronation of Queen Elizabeth II. Marx also produced boxed playsets that featured many famous battles with armies of two sides, character figures, and