Building sand castles, most people will tell you, is a summer pastime for children at the beach. But not for Paul Hoggard, Remy Geerts, Craig Mutch and Calixto Molina, who have turned sand castles into a form of art and rewarding careers.
The four sand artists came to Hong Kong to make sand sculptures for the city's Olympic team. Their grand design in Tsuen Wan Plaza used up 30 tonnes of sand. Their tallest sculpture is 3.3 metres. One creation, in homage to the Games' host city, features a double-decker bus, London's Big Ben, and Queen Elizabeth II holding an Olympic torch.
Another showcases our five strongest sports - table tennis, windsurfing, equestrianism, swimming, and cycling - under the city's official flower, the bauhinia.
The idea of building sand castles in a shopping mall may sound unconventional - and even absurd. But not to the artists.
'We have done it a few times in shopping centres before,' says Hoggard. The Briton, who with his partner, Geerts, runs Sandartist Ltd, says art galleries, cathedrals or wedding parties aren't strange places to them, either.
But indoor sculpting isn't without challenges. You can't dig down and space can be limited. 'We're a bit confined,' Geerts admits. 'And we have to keep it clean.'