Since 1956, calligraffiti in Chinese by Tsang Tsou-choi blossomed on ruined walls in Hong Kong as a protest against the loss of his motherland to the British. He carefully chose his canvas, only writing on government property. He continued his protests until the early 2000s and died in 2007 of a heart attack. In 2015, due to a strong rain, his letters which were previously buffed by the Hong Kong authorities resurfaced, catching instant attention of citizens who grew up with these letters of peaceful protest.
Writers will always be stronger than repression.