Inside a brightly-lit room in a lighting store, painting teacher Zeng Bailiang and his group of volunteers are patiently teaching a group of blind students the basics of Chinese painting.
The students in the classes in Nanning, the provincial capital of China's southern Guangxi province, spend hours practising brushstrokes on a special paper, feeling with their fingers the different wet and dry areas to guide them on their painting.
Eventually they get to the point where they can dip a brush, similar to the ones used for Chinese calligraphy, into black ink and draw things such as mountains or bamboo trees with long strokes. Short strokes can create flowers or birds.
Zeng, 55, is a self-taught artist who has been conducting classes for the blind for the past several decades. He says the classes fuel his passion for art with a sense of satisfaction that comes from helping the students - many of whom were orphans who came to him wanting something new and fun to do.