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If you know it by some other name, you could think of it as a toy that never falls, no matter how hard you hit it, and sells in variants which look like this. If you try to make it stand in some other way, or try to knock it down, it moves back to that single stable position, gradually. When placed on its side, it starts rocking magically, gains momentum, straightens itself and gradually comes to rest in that single position. Here is a video of a Gomboc doing its thing. A Gomboc is an object surrounded by a number of complex curves, it takes an immense amount of accuracy to get the surfaces right. For better, people have started 3D printing these complex shapes.