There is a the portrait of Mao. . . which gives legitimacy to the PRC's founder, and the words, on the left:

中华人民共和国万岁 (Long Live the Central People's Government)

and, on the right:

世界人民大团结万岁 (Long Live the Great Unity of the World's People)

These words give the state power and its key that they lie at the center of Beijing. I can think of no more official text for the city, and for China now. In Beijing you can't escape the government and the multiple apparatuses of the state. It hangs heavy in the air. You can feel it when you enter the city. . . similar to Beltway culture in DC. . . and nothing is ever too far away from Politics here.