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[[Image:Celt_with_gemstone_turtles-01.jpg|thumb|200px|Carved wooden rattleback]]
A '''rattleback''', also known as a "celt," "Celtic stone," "rattlerock," "spin bar," "anagyre," "Tate's," "wobble stone" or "wobblestone," and by the product names "ARK," "Bizzaro Swirls," "RATTLEBACKS," "Space Pet" and "Space Toy," is a semi-ellipsoidal [[top]] which will spin on its axis in a preferred direction. But, if spun in the opposite direction, it becomes unstable, "rattles," stops and reverses its spin to the preferred direction.
:''Behold the mysterious celt,''
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