Weird Bike Wednesday - Tracked Bicycle

Note the continuous track in place of a rear wheel (photo courtesy of Bikejuju)

Here's a very strange bicycle I ran across on the Internet. The front wheel is odd, but the entire back wheel has been replaced with a continuous track. I have no idea where the mechanism in the rear came from. Note that there are no handlebars. Steering is done with a couple levers in front of the saddle. I haven't been able to find out much about this bike, except that the photo was taken at a 2010 Tour de Fat event in Seattle.