Spirograph a hypocycloid. Spirograph Spirograph is a geometric drawing toy that produces mathematical roulette curves of the variety technically known as hypotrochoids and epitrochoids. It was developed by British engineer Denys Fisher and first sold in 1965. The name has been a registered trademark of Hasbro Inc. since 1998 following purchase of the company that had acquired the Denys Fisher company. The Spirograph brand was relaunched worldwide with original product configurations in 2013 by Kahootz Toys. In 1827 English architect and engineer Peter Hubert Desvignes developed his "Speiragraph", a machine to create elaborate spiral drawings, intended to prevent bank note forgeries.
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