Roomba light trail

Does the light in the fridge really turn off when the door closes? If a tree falls in the forest when no-one's around, does it make a sound? When a Ro

Does the light in the fridge really turn off when the door closes? If a tree falls in the forest when no-one's around, does it make a sound? When a Roomba vacuums a room, where in the room does the Roomba vacuum?While there's surely no way of answering the first two (except for drilling a hole in your fridge door and setting up a camera by a particularly creaky looking tree) the third has been answered with a mesmerising long exposure photo by one curious Roomba owner.

Signaltheorist turned off all the lights, set a camera on long exposure, let Roomba roam free and then came back half an hour later. The fantastic photo proves to doubters out there that a Roomba does in fact make it into all the corners.

However, Signaltheorist makes no mention of whether the carpet was any cleaner after 30 minutes...