Sculptor Wu Ligu (C) talks about an ink-stone once collected by Song Dynasty (960-1279) poet Su Shi at an exhibition in Beijing, Jan 28, 2016. The exhibition contains all kinds of ink-stones relevant to the famous poet and calligrapher, who is also known as Su Dongpo, to introduce the production process and culture of the device, used for the grinding and containment of ink. [Photo/China News Service]