Travel as the quintessential colonial act&mdashappropriating the free, domesticating the wild to establish the known in an unknown place&mdashis a meaty subject for picking apart, and writers through the ages have indulged the itch to do so. Defoe&rsquos colossus has been the point of departure for countless imitations, derivations, parodies, and subversions. Robinsonades, for the most part, merely tweak things around to their liking. There are worshipful ripoffs like R M Ballantyne&rsquos The Coral Island (1858), spitting satires like Jonathan Swift&rsquos Gulliver&rsquos Travels (1726), and bitter psycho-theological subversions like Golding&rsquos Lord of the Flies (1954) and Pincher Martin. And so on and so forth, all the way down into the 21st century with JM Coetzee&rsquos postcolonial, gender-reversed reading of the colonial castaway trope in Foe (1987), and this year&rsquos Man-Booker prize-winning novel, Yann Martel&rsquos Life of Pi,which sets an Indian teenager adrift in the Pacific with a Bengal tiger for company.