In the 1960s a group of Japanese architects dreamed of future cities and produced exciting new ideas. The visions of Kurokawa Kisho, Kikutake Kiyonori, Maki Fumihiko, and other architects who had come under the influence of Tange Kenzo gave birth to an architectural movement that was called "Metabolism." The name, taken from the biological concept, came from an image of architecture and cities that shared the ability of living organisms to keep growing, reproducing, and transforming in response to their environments. Their ideas were magnificent and surprising, with concepts such as marine cities that spanned Tokyo Bay, and cities connected by highways in the sky where automobiles pass between clusters of high-rise buildings.