The original vortex based design was supposed to resist all swaying by providing vortical wind traps that "guided wind" along vortical paths instead of providing a "flat" wind-block.

Also, to allay TBs fears the original design was capable of mass evacuation via jumping out the window. The building's shape and windows acted like a huge slide for each grouping of floors. It was possible to "control slide" all the way down to the first floor.

To be honest, this design looks like it has cut corners on these two key elements and doesn't adhere to the true logarithmic ratio for optimum form. Of course, it may just be the digital artist that has incorrectly portrayed it.