Newzealand has already given us lots of excitement with bungee jumping. Now , it's the Zorb's turn . Have you ever wondered what it would be like to roll down a hill at speeds of up to 30 mph inside a huge ball? Perhaps not , but that was what Andrew Akers wondered while he was looking through some drawings by Leonard da Vinci , or so he says . Wherever the idea came from , Andrew and ex-research scientist Dwane van der Sluis began designing such a ball,whic they called a Zorb .