How many bicycles do you need in your life? For 67-year-old Chai Lin, the answer is 1,300 and counting.
Bicycles were first introduced into China in the 19th century. During the past several decades, they have evolved from a symbol of wealth to a common means of transportation.
Chai's obsession with bicycles dates back to the 1960s when he saw some people riding the two-wheeled vehicle in his home city of Lanzhou, capital of northwest China's Gansu Province.