Thor Heyerdahl proved this, of course, by building what was essentially a 45-foot balsa doormat. Kon-Tiki was little more than nine logs strapped together with hemp — hmm, a “smoking” gun, perhaps? — a bamboo deck and a mast whittled out of mangrove bushes. Just building such a “boat” wasn’t enough, and to make his point, Thor sailed/drifted her/it across the Pacific, spawning a book and a film that served as the inspiration for other dreamers to attempt similar feats of insanity. A few years back a group of academics set their minds to sailing a 40-foot tar ball across the Indian Ocean. Their creation ended up on the bottom 30 minutes after the launch party. More recently a fellow assembled 12,500 2-liter plastic bottles in the shape of a ship and christened it Plastiki — how original.