Visiting the ancient Forbidden City in Beijing you might come across some old walls which have a pink paint on the plaster.
I could've thought that without all the careful maintenance that goes into the complex the walls would weather and have the repatch/sand and repaint look and some smart aleck would sneak in some graffiti on those grand walls and issue an urgent and passionate request :
'I slept, but my heart was awake
a sound! My beloved is knocking..
..make haste my beloved..'
Song 5:2 and 8:14