How Do You Protest in the Face of Censorship? An Empty Sign

In China, Russia and the United Kingdom, unmarked sheets of white paper have become a potent symbol of defiance.

Commentators were quick to interpret the meaning of the “white-paper protests.” A blank sign is both a symbol and a tactic. It is a passive-aggressive protest against censorship, a sarcastic performance of compliance that signals defiance. Its power rests in a shared understanding, by both the public and the authorities, of the unwritten message; it rests also in the awareness that to say anything at all is to run afoul of a government that brooks no opposition, suppressing even the suggestion of an intention to speak. 

https://www.nytimes.com/2022/12/21/magazine/white-paper-protests-censorship.html