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This makes the rattleback a physical curiosity that has excited human imagination since prehistorical times.<ref>"celt, n.2". OED Online. September 2012. Oxford University Press. 1 October 2012 <http://www.oed.com/view/Entry/29533?isAdvanced=false&result=2&rskey=EPfrjA&></ref>
==Other names==
A rattleback may also be known as a "anagyre", "[[celt (tool)|celt]]", "Celtic stone", "druid stone", "rebellious celt", "rattlerock", "spin bar", "Robinson Reverser", "wobble stone" (or "wobblestone") and by the product names "ARK", "Bizzaro Swirl", "RATTLEBACK", "Space Pet" and "Space Toy".
==History==
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