Spirograph 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. The mathematician
Plastic lumber can be molded to meet almost any desired spatial condition, a major advantage over wood. It can also be bent and fixed to form strong arching curves. Plastic lumber works like wood - it can be shaped using conventional woodworking tools. At the same time, it is waterproof and resists all types of rot and mold, although it is not as rigid as wood and may slightly deform in extremely hot weather. Plastic lumber is not sensitive to staining from a variety of agents. A major selling point of this material is it doesn't need to be painted. It is