Dicycles are nothing new, and if you count styrofoam treadmills neither are floating dicycles. But I have yet to see something like GBO’s bike path hogging concept, amazingly called Di-Cycle, which can do both.
This true amphibuous bike won Helmond’s GBO the Brabantse Spelen design competition in 2005. Unfortunately, the design has never left the conceptual phase, but fortunately you can still go gawk at it at the Fiets exhibition that runs until October 5.
See also: Bike your house around.
Photo by Designhuis / Patrick Meis. Via PSFK and a long string of other design blogs.