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).
Rose-Lynn Fisher variety of emotional tears. Rose-Lynn Fisher Rose-Lynn Fisher (born 1955) is a Los Angeles-based American photographer known for her series "Bee" and "The Topography of Tears." Fisher was born in Minneapolis, Minnesota, in 1955. She studied at Otis Art Institute in Los Angeles, California, receiving her BFA in 1978; she also studied at UCLA and UCSC. She was trained as a painter. She lives in Los Angeles. Fisher's interests have included microphotography, using both a scanning electron microscope (SEM), and an optical microscope; also aerial photography, photographic research in Morocco, and mixed media painting including geometric patterns and collage. While