Automatic vacuum cleaners, like the Roomba, can't usually do stairs. But the Slinky Roomba can! Simply set it on the top step and go make yourself a cup of tea.
Looking like a hinged L-shape, the Slinky Roomba sidles left-to-right until the step is clean, whereupon the motorized hinge unfolds and the entire contraption journeys, slinky-style, to the step below.
Once the cleaning is done, Slinky Roomba can be set to walk aimlessly around the house in an inching, caterpillar-like motion to entertain young children.