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【Interesting to Play】Cool stuff for kids, teens, adults, girls and boys,women and men. You may revolve it as a single unit or stack them together to make it more impressive, play with it at home, at the office, on the trip, on the plane, for fun or to kill boredom.
【Amazing Optical Illusion】:Simply rotate it by hand to creates an almost magical effect that looks like continuously flowing helix would merge into a surface of tabletop.