Rotundus the robot is suited for rough terrain, handling snow, mud, sand and water. It can travel 10km/h fast.
"A critical property of a spherical robot is how close the centre of mass is to its shell - the closer the more power."
The principles of the technology used to locomote the spherical robot is shown in an animation on the manufacturer's page.
I have to admire this elegant design! Those Swedes! I want one
Maybe, with a compartment in it for a drink that would be shaken during delivery?