What fascinates Iyer is how this dizzying degree of cultural interfacing affects our sense of home. "Having grown up with three cultures simultaneously," he says, talking from his home in Japan, "of which none was fully my own, I have always felt homeless. Later when I began travelling, the question kept returning: who are we when there is no one around?" That philosophical question was given greater urgency by the fire which consumed his Santa Barbara home and destroyed a lifetime of photographs, letters and mementoes. "That forced me to realise that my house was more than the four walls where I spent my nights," he recalls. "It also reinforced in me the idea that I have a snail's sense of home: something small and portable I carry with me.'