Spirograph Bruno Abakanowicz invented the Spirograph between 1881 and 1900. It was used for calculating an area delimited by curves. Drawing toys based on gears have been around since at least 1908, when "The Marvelous Wondergraph" was advertised in the Sears catalog. An article describing how to make a Wondergraph drawing machine appeared in the "Boys Mechanic" publication in 1913. The Spirograph itself was developed by the British engineer Denys Fisher, who exhibited at the 1965 Nuremberg International Toy Fair. It was subsequently produced by his company. US distribution rights were acquired by Kenner, Inc., which introduced it to the United
Geometric and Functional Analysis "Geometric Aspects of Functional Analysis" of which Vitali Milman had been one of the main organizers in the previous years. The journal retained the same acronym as the series to stress the connection between the two. The journal is reviewed cover-to-cover in Mathematical Reviews and Zentralblatt MATH and is indexed cover-to-cover in the Web of Science. According to the "Journal Citation Reports", the journal has a 2015 impact factor of 1.476. The journal has four editors: Vitali Milman (editor-in-chief), Mikhail Gromov, Simon Donaldson and Peter Sarnak. Geometric and Functional Analysis "Geometric and Functional Analysis" ("GAFA") is a mathematical journal published