The Flowlab Skateboard designed by Mike Simonian has extra wheels that let you lean at a 45 degree angle to simulate the feel of snowboarding or surfing while on land.
The Flowlab Skateboard allows you to surf without waves and ride without snow. Years of experimentation resulted in the geometry that allows a device with no moving parts to simulate the fluid motion of snowboarding or surfing on land. The arced axles let you carve to 45 degree angles with no resistance and fluid transitions edge-to-edge.
via Gizmodo
