Protesters stretching out a 500-meter (1,640-foot) long black cloth march past a LED screen showing a picture of China's late leader Deng Xiaoping during a rally in a downtown street in Hong Kong, Sept. 14, 2014 to show their determination for genuine universal suffrage.

Hong Kong Crisis Tests China's 'One Country, Two Systems' Model

Some experts say that the model designed three decades ago is at risk of collapse.