Since 1949, if you live in China, you have to put up with the over exposure of Chairman Mao because he does not only put in an appearance at Tian'anmen Square but also on the banknotes which you have to reach everyday.
He must bore you with the same complexion but it's not his fault because it's you that have been overlooking his potential facial expressions! I knew this little practical joke many years ago and should've post it yesterday(April Fools' Day). Later better than never. Now let me share it with you. Just take out any banknote with Mao and fold it as the following instruction tells you, then you'll find out.
Done? Now try to watch Mao from different positions...There you go! Mao is literally sentimental and has a mobile face!