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The Sphere is theory of an 3D workspace. The SphereXP is an example of the theory. The environment is user-centered. It is represented by a sphere. The user is exactly in the middle of it. All objects are situated around the user. He can easily turn around and manipulate with the objects. All the objects that users are used to having on their regular desktop are now integrated in a three-dimensional environment. . There are icons and applications. They can be move around according to some rules. You can bring them closer to the view port or send them back.