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What is the PhiTOP? It is a prolate ellipsoid with a highly specific ratio of length/width. It is a unique spinning top. It is a beautiful kinetic artwork. It is an elegant miniature sculpture. It is an effective stress reliever. And it demonstrates a bevy of scientific concepts from disparate studies in the field of physics! Spin it on its side at high speeds and watch as it seemingly magically rises to an upright/vertical position as it turns! The set also includes a concave mirrored surface to help you get the hang of your spinning technique. Makes an excellent conversation starter, and a great and unique gift for all ages.