Magically Levitating Balls Could Be the Future of Computer Interfaces: The system utilizes a moving stack of powerful, computer controlled magnets to levitate a steel sphere as well as an optical tracking system and a projector.
Both the user and the computer can communicate by moving a steel ball within a three-dimensional space. The system will track the ball as the user moves it within the space—essentially programming a flight path—and then "play back" ball's exact trajectory indefinitely by manipulating the intensity of the magnets' repulsion. The projecter is used to display images onto the the floating sphere.
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