This is just a version 1.0, if not less. Imagine when the columns become much smaller and the amount of them increases. That coupled with higher resolution projectors can make for some real cool applications of the technology.
I've long thought that this sort of thing would be awesome for virtual reality applications. Add independently moving motorized ball bearings to the tips of each column and you could have an multi-directional treadmill with the ability to simulate different terrains.