Roomba map

Someone who owns a Roomba robot vacuum set up a camera in a room and took a long-exposure of the vacuum cleaning. The picture shows the path of the Roomba through it’s cleaning cycle.

I bought a Roomba a few years back and although it did a great job cleaning, it doesn't do extremely well in large, irregularly shaped, disjointed areas. It has problems mapping areas well that have a lot of obstructions too. So it turned out to be more work to use Roomba than vacuuming by hand.