Artist Frank Bölter created a life-sized origami boat to sail up the Elbe. The boat cost £110 to construct back in '97 (today's conversion rate would put that at $175). The boat is 30 feet long, and weighs 55 pounds. It took 2 hours to construct, using a 170 square meter sheet of paper.
Hope he figures out how to fly away in a life-sized paper airplane next.