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Brands build 3D worlds in which they invite their clients. Now as part of a separate 3D world, later everything will be connected, so that you don't have a clue of in which 3D world you really are. Just like in the real, physical world. There is only one physical world, and within that are lots of little 3D worlds which trouble free connect to each other. When passing a border, for example the border of a yard, there usually is some kind of dividing line, which however is easy to pass (from several directions). Virtual brand worlds will develop just like that.