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Liu Zexian, 78, shows pen pictures of old buildings in Changchun city, capital of Northeast China's Jilin province. Previously, Liu worked in the field of mechanical design and over 11 years has created 330 pictures showcasing the city's traditional architecture. He said he hopes his pictures can help people better understand the city's history. Mostly, Liu makes the pictures using a pen and a magnifier. [Photo/China News Service]