Displaying and carrying huge portraits of the great and the noble has long been an integral tradition of the elaborate celebrations of National Day holidays in communist countries.
The mainland has been no exception, but changes in the faces on the portraits provide a telling story of ideological transformation over the past 60 years.
For National Day celebrations since the beginning of the 1950s, the authorities usually installed the portraits of Karl Marx and Friedrich Engels on the east side of Tiananmen Square and those of Vladimir Lenin and Josef Stalin on the west side - with the portrait of Sun Yat-sen in the middle of the square, directly facing that of Mao Zedong , permanently hanging on the rostrum.
The message was simple and clear: the Communist Party owed its lineage and ideology to Marx, Engels, Lenin and Stalin, to Mao for the founding of the People's Republic of China, and to Sun not only for his leadership in ending the feudal dynasties but also as a symbol of reunification with Taiwan, since Sun founded the Kuomintang.
But in April 1989, the mainland's leadership decided against using the portraits of Marx, Engels, Lenin and Stalin for future National Day celebrations, noting that most other countries displayed images of only their own national heroes. Only the portrait of Sun is now brought out for special days.
Of course, there is more to the move than that. It was then that communist countries started to fall like dominoes in eastern Europe and the Soviet Union was on the brink of falling apart. The mainland, too, was about to undergo one of its most tumultuous tragedies, in Tiananmen Square.