Here is a short video that on one level is maybe just a slick marketing gimmick.. but seen through the eyes of an architect, it is a transformation of a public space (this happens to be michigan avenue in chicago), not by fancy moving architecture, but people itself animating the existing form. Click through the link to get a better video or a different angle of view - they are plenty of this event on youtube
Spatial transformation is not always about a built intervention that adapts to or obeys human command, but can also be a dramatic human intervention - a special event that makes us look at form in a way that we didn't think was possible.
It would be nice to see lots of more interesting examples of spatial transformation.
Check out the official video of the song to get better quality audio.