This is very interesting as well as being just a cool picture. By working out how long it took for a Roomba to go through a room, turning the lights out and figuring out the exposure settings, this photographer managed to catch the path of the sucker throughout the whole process.
That’s pretty cool, but now all I can think of are other ways of tracking the little bot. Webcam on its “head”? Merge multiple normal exposures? Attach a sharpie to its “tail”? So many experiments to do, and I don’t even own a Roomba! I guess when I move to my new hardwood floor apartment, I can track my Fukitorimushi.