Kong Zhaojin shows a imprinted bricks made in Han Dynasty (206BC-220AD) in Xuchang, central China’s Henan Province. Mr. Kong has collected some 360 bricks with imprinted patterns that dated back to ancient China's Han Dynasty for more than 40 years. (Xinhua Photo)

Photo taken on April 7, 2008 shows Kong Zhaojin's collection of imprinted bricks made in Han Dynasty (206BC-220AD) in Xuchang, central China’s Henan Province. Mr. Kong has collected some 360 bricks with imprinted patterns that dated back to ancient China's Han Dynasty for more than 40 years. (Xinhua Photo)