"What if I should fall right through the centre of the Earth ... oh, and come out the other side, where people walk upside down?" Have you ever wondered, like the titular protagonist of Lewis Carroll's Alice in Wonderland, what it would be like to find a place where everything seems flipped on its head? If so, visiting the first-floor exhibition hall at the Tsuen Wan Plaza shopping mall might give you some idea. Here, local artists Fei and Alex Wong, who are father and son, have created their own Wonderland by turning Santa Claus' house upside down. The life-sized house, fully furnished and decorated for the festive season, is completely inverted. A table groaning with a Christmas feast hangs from the ceiling in the dining room while, in another room, the old man himself is ensconced in a gravity-defying rocking chair next to a fireplace whose chimney reaches out of the ground. Visitors enter through an upside-down door - and then have the chance to get creative with their cameras. The trick is to click then turn your photo upside down. If you get someone in the right pose, says Wong, they'll look as though they're coming down the chimney to greet Santa. The artists were inspired by an upside-down house built in Austria by architects Irek Glowacki and Marek Rozhanski. That house, which looks from the outside as though it has been uprooted by a tornado, is now a major tourist attraction. "We have taken it one step further by combining the life-size model with 3-D trick art on the ground," Wong says. "If you take pictures from a distance, you will see Santa's house standing on the edge of an ice river." Santa's Upside Down House is open from noon until 9pm every day until January 1. Admission is free on weekdays but on weekends, you need to spend HK$100 in the mall first to gain admission. Upload your upside-down photos from the house to www.facebook.com/tsuenwanplaza and you will win up to HK$2,000 in shopping vouchers to use at the mall if any of your shots are among the most "Liked".