As massive demonstrations rock Hong Kong’s streets, protest art—not in the form of graffiti, but in the form of sticky notes—has popped up all over the city.

The walls of Hong Kong are now hotspots for people to vent their anger against the government and offer words of encouragement.

How did sticky notes become a dominant form of protest? And what are the demonstrations about anyway? We checked out a few of these “Lennon Walls” to find out.

If you liked this video, we have more videos about Hong Kong, including:

The People Saving Hong Kong’s Neon Lights
https://www.youtube.com/watch?v=mzbCgeMRy68

This Hong Kong Artist’s ‘Ugly’ Cartoons Made it to the Guggenheim
https://www.youtube.com/watch?v=6dCtjxVBtvs

How Hong Kong Became a Refuge for Wild Parrots
https://www.youtube.com/watch?v=9ZroQO_quW8

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Producer and Narrator: Venus Wu
Videographer and Editor: Mario Chui
Animation: Ray Ngan
Mastering: Victor Peña

Music: Audio Network