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).
Fisher-Price toys, which includes people and animal figures along with various play sets such as a house, farm, school, garage and vehicles. The figures, which originally were wooden peg-style characters, are now molded of plastic and have detailed features. In addition to Little People, some of the toys and toy brands that have remained popular for many years include Power Wheels, View-Master, Rescue Heroes, the Chatter Telephone, and the Rock-a-Stack. Other brands marketed under the Fisher-Price name over the years include Disney, Sesame Street, Dora the Explorer, and See 'n Say. Fisher-Price also designs and sells infant care products and has