Weird Bike Wednesday - Tree Branch Bicycle

The frame is made from a tree branch (Photo courtesy of Bike Rumor)

Out on the Bike Rumor website, I found this bike, which used a tree branch for its frame. It was built by Steve Chang, the marketing manager at Calfee Designs. They were one of the first to use carbon fiber for bicycle frames, and later became known for their bamboo frames. The tree branch used for this bike was found near the shop. While I must give Steve high marks for resourcefulness and using low cost material, I'm just not sold on the idea of tree branch bicycle. My questions is "If it's strong enough to use for a bicycle frame, why isn't it still attached to the tree"?