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Give this top one spin and watch it spin for hours and sometimes even days! A Kinetic Mystery! Can your brain explain what your senses experience? More than a mystery...it's an exercise in knowledge! Spin this unique top on its 3 1/4 inch base and watch as it just goes and goes and goes. Have fun as you watch your friends try to figure out why the top doesn't stop. People might wonder if this is a true perpetual motion machine.