A world of ubiquitous depth sensors could be quite interesting indeed. FastCo writes,
Harnessing the scanning technology of the Kinect, Semantic Paint creates a 3-D scan of the room you’re in, in real time. Initially, it sees the room as a single object, but users can begin labeling individual objects, just by coloring them in.
Check it out:
https://www.youtube.com/watch?v=YdmlL8Jn-kY
[YouTube]