Visitors behold an abacus in the shape of bagua, the eight diagrams used in Taoist cosmology, at the China Abacus Museum in the city of Nantong in east China's Jiangsu Province, on May 17, 2012. The museum is home to 13,000 various relics showcasing the abacus in Chinese history. The main theme of the museum this year is to meet new challenges amid changes of museums in the world, as International Museum Day approaches on May 18 (XINHUA) |