Dai Haifei, 24, from China's Hunan province, looks out from his egg-shaped mobile house where he has been living for the last two months, located near his office in Beijing on December 1, 2010. The house cost about 1,000 USD to build, and is made of bamboo strips and a mattress, covered by a layer of heat preservation and water-proof material, with patches of bags stuffed with processed wood peels and grass seeds that could grow grass when spring comes, covering the house like a quilt.