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Sat 05 May 2004The UnhandymanINVENTIONS: Kenji Kawakami is father of the anarchic Japanese art of 'unuseless inventions' - the portable zebra crossing, the banana opener, the double-headed toothbrush. He tells David McNeill about the Chindogu principleLet's be frank. Kenji Kawakami looks a bit barmy: hooded eyes staring unnervingly beneath what appears to be shaved eyebrows, topped by an unruly mop of hair. And this is before he happily poses for photographs with a toilet-roll dispenser on his head. "It's for sufferers of hay fever," he explains. "They blow their noses a lot."