Like something out of a cartoon

I found this on Yahoo news, it is a great idea. I know sometimes when I know I won't want to get up in the morning, I put an alarm clock far away so I have to get up to shut it off.

LONDON (Reuters) - Can't get out of bed in the morning?

Scientists at MIT's Media Lab in the United States have invented an alarm clock called Clocky to make even the doziest sleepers, who repeatedly hit the snooze button, leap out of bed.
After the snooze button is pressed, the clock, which is equipped with a set of wheels, rolls off the table to another part of the room.
"When the alarm sounds again, simply finding Clocky ought to be strenuous enough to prevent even the doziest owner from going back to sleep," New Scientist magazine said Tuesday.

I just don't understand how it knows where walls are or if it's like those little toys that run into walls and turn and keep going. That would be awesome!