Mario Diamantis spent a lot of his childhood hanging upside down from trees. But in a tree, you're stuck. Skybike is the solution to his eternal childhood dilemma: Freedom.

Skybike Is the Closest You'll Ever to Get Bicycling on Clouds

Well, depending on how you define freedom. It is like riding a bike on the sky. But, um, harder. You're actually peddling against your own weight while strapped in at a 45-degree angle, so while Mario's taken the hand-built bike—which is made almost entirely out of scraps found in the streets of NYC—across bridges, he's only been able to ride it for about 25 minutes continuously before freedom takes its toll.

But maybe a warp-drive-powered version is how we'll reach the stars one day. [Skybike at ITP]