By Dr. Uli Sigg, Special to CNN
Before Ai Weiwei's works went for millions, Uli Sigg was quietly amassing the world's largest Chinese contemporary art collection -- which today, is worth millions. Beginning in the 90s, he met with over 2,000 artists, and bought from now famous artists. In an op-ed for CNN Style, Sigg discusses how his collection reveals Chinese art as a response to the country's political environs and how it has evolved to present day.