The combination of giving developers full control over dimensionality and the quality of movement of objects within that space will open up galaxies of new possibilities.
And when you think about how something like Facebook could be represented on a variety of screens it becomes clear that we have different metabolism for dimensionality on different size screens.
Yet a final contrast of forms, between the light thinness of the building proper and the solid three-dimensionality of the tower, hints of the full-blown Greek-revival style of the coming generation.
Second, cyberspace turns out to have all kinds of novel spatial properties (see the new book, Cyberspace and Security: A Fundamentally New Approach, by Victor Sheymov, excerpted in this comment for more on this), but three-dimensionality is not among them.