Web Urbanist just posted a nice compilation of odd and/or neat bicycle concepts, including the giant floating amphibious Di-Cycle shown top right or the sideways riding bicycle on bottom left.
Hit “more” for video of that sideways bike and more pics…
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Here’s some video of the Sideways Bike riding along in Amsterdam.
The Rotation folding bicycle allows the user to adjust handlebar and seat position to accomodate different sizes and shapes.  What’s really cool is how the front wheel folds backward between the two rear wheels.
Check Web Urbanist’s post to see all 15 concepts.