Just north of Amsterdam's most famous canals, there's an island of fat bobbing up and down in the sea by a wharf in a former shipyard. Right now it's the size of a Volkswagen Beetle and weighs a metric ton, but its creators, Mike Thompson and Arne Hendricks, say it will be big enough to walk on one day. Thompson and Hendricks are designers by trade, and they have been working on their island of fat for years. They call it Fatberg, with a capital "F," and one day, when it's big enough to stand on, they hope to tow it the North Pole.