The museum, home to famous works from masters such as Leonardo da Vinci, is the most visited museum in the world with around 10 million visitors last year.

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The house is one of the Dali triad that includes the Dali Theatre-Museum in Figueres and the Gala Dali Castle-House Museum in Pubol, but Portlligat is where the famous Surrealist lived from 1930 to 1982 and where he created works like The Madonna of Portlligat.

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Upstairs, Mr Cai has built a mini rollercoaster in a cavernous gallery, on whose ceiling is painted Mr Cai's history of Belgian art images from the city's famous Ghent altarpiece and iconic works by Magritte and Broodthaers.

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Although there are always bottom-feeders in search of a bargain, for the most part buyers will shy away from second-rate or difficult works, even by famous names.

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