"I'm Sean Kenney, the artist that created this LEGO bike at a public event earlier this month.
I've explained more about the sculpture, why I created it, how kids helped, and have a lot more photos on my web site.
... And as for "how many prototypes" ... just one! I made a half-scale bike (3 feet long) to wrap my head around the physics of it all before creating the full-size one at the event."
via Bit Rebels
note: My profuse apologies to Sean for misattributing someone else as the creators of this awesome machine. Glad I could put things right.