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A roly-poly toy, round-bottomed doll, tilting doll, tumbler or wobbly man is a toy that rights itself when pushed over. The bottom of a roly-poly toy is round, roughly a hemisphere. Many roly-poly toys are hollow, with a weight inside the bottom. They have a center of mass below the center of the hemisphere, so that any tilting raises the center of mass. When such a toy is pushed over, it wobbles for a few moments while it seeks the upright orientation, which has an equilibrium at the minimum gravitational potential energy. The toy can represent a person, an animal, or anything else. Different toy manufacturers and different cultures produce different-looking roly-poly toys: the okiagari-koboshi and some types of Daruma doll of Japan, the nevаlashka or vanka-vstanka of Russia,〔(The St. Petersburger - Russian Tilting Doll )〕〔(Vanki-Vstanki Studio ) (SWF)〕 and Playskool's Weebles. Japanese ''okiagari'' means "to get up (''oki'') and arise (''agari'')"; the self-righting characteristic of the toy has come to symbolize the ability to have success, overcome adversity, and recover from misfortune.〔Kyburz, Josef A., "Omocha': Things to Play (or Not to Play) With" ''Asian Folklore Studies'', Vol. 53, No. 1 (1994), p. 15.〕 Traditional Chinese examples are hollow clay figures of plump children, but "many Chinese folk artists shape their tumblers in the image of clownish mandarins as they appear on stage; in this way they mock the inefficiency and ineptitude of the bureaucrats".〔Lang Shaojun, "Traditional Chinese Painting in the Twentieth Century", ''Three Thousand Years of Chinese Painting'' (New Haven: Yale UP, 1997), p. 312. ISBN 0-300-07013-6〕 A toy manufacturer recommends roly-poly toys for small children just developing motor skills; a child can bat at it without its rolling away.〔(Fisher-Price - All About Play ... stages, toys & tips: Roly-poly bat-at toys )〕 Dynamogene Theater stages a performance called "Monsieur Culbuto", allowing the audience to interact with a human dressed as a roly-poly toy.〔(Batyamfest 2008 festival shows: international program )〕〔(Dynamogene: M Culbuto ) (French language)〕 The Noddy stories by Enid Blyton have characters Mr. and Mrs Wobblyman, who are based on this sort of roly-poly toy. One of the puppets/non-human presenters in the TV show ''Playbus'' (later ''Playdays'') was a roly-poly clown called Wobble. == See also == * Monostatic polytope * Gömböc 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Roly-poly toy」の詳細全文を読む スポンサード リンク
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