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.
The Sleep of Reason Produces Monsters The Sleep of Reason Produces Monsters __notoc__ The Sleep of Reason Produces Monsters () is an etching by the Spanish painter and printmaker Francisco Goya. Created between 1797 and 1799, it is the 43rd of 80 etchings making up the suite of satires "Los Caprichos". Goya imagines himself asleep amidst his drawing tools, his reason dulled by slumber and bedeviled by creatures that prowl in the dark. The work includes owls that may be symbols of folly and bats symbolizing ignorance. The artist's nightmare reflected his view of Spanish society, which he portrayed in the "Caprichos" as demented, corrupt, and