A few weeks ago I purchased a Leap Motion Controller: one of those devices that tracks your finger movements and translates them into actions on your laptop screen. I was pretty impressed with the device's accuracy, but I ended up returning it because I didn't see how it had practical applications for my own work. After the initial excitement of moving windows with your hands (pretending you're in a sci-fi movie) fades off, the old-fashioned method of clicking is simply easier and more convenient.

Viewing this "Night Walk" demonstration, I felt an inkling of regret about returning Leap Motion. As others have noted, the experience is very immersive and exciting. The only thing holding it back, in my opinion, is the medium of mouse and keyboard. I wanted to move fluidly through Marseille instead of incrementally, through clicking and jerky motions of the mouse. If this kind of 3D / WebGL / geospatial content becomes more prevalent on the web, I can see a stronger practical use case for everyone owning Leap, or something like it.