YouTube - Impossible motion: magnet-like slopesWinner of the Best Visual Illusion of the Year Contest 2010 http://illusioncontest.neuralcorrelate.com Koukichi Sugihara Meiji Institute for Advanced Study of Mathematical Sciences, Japan In this video, wooden balls roll up the slopes just as if they are pulled by a magnet. The behavior of the balls seems impossible, because it is against the gravity. The video is not a computer graphic, but
