Bryan Berg didn't just build a house of cards, he completed an Olympic village of cards. Over the past three weeks at Langham Place mall, the card-stacking world-record holder has been erecting his own 'Bird's Nest' and 'Water Cube' using more than 2,400 packs of cards. He finished the task yesterday. 'I'm always kind of a nutcase on the last day, because I always have an idea in my mind exactly how I want it to look. I am always, like 'oh, one more tower, one more card here',' Berg (above) said. The Iowa native admitted that the toughest structure to recreate was the oddly shaped oval 'Bird's Nest', which came close to collapsing. 'I usually built with just rectangles ... and I don't bend, tape, glue or alter cards in any way. That's my rules, but the 'Bird's Nest' was extremely difficult. It is larger at the top than the bottom so I had to come up with a way to pixelate it.' Berg has spent the past 20 days at the mall stacking from noon to 8pm or 9pm, and then found some time to look around. He and his wife managed to visit Temple Street, the Big Buddha, the flower market and The Peak. As for the Olympic village, it's staying up until Thursday.