Hong Kong has been rocked by waves of protests against the government’s extradition bill since June. But while opposition to the now-suspended bill has at times been fierce, the episode has also inspired many Hongkongers to express themselves in a quieter, more creative way.Since last week, displays of colourful sticky notes have sprouted up across the city, making international headlines. Known as Lennon Walls, the displays made up of anti-bill messages and other protest statements have…