Supporters of the Hong Kong pro-democracy protests have spent months spreading messages in Post-it notes.
Throughout the city, the notes have become an enduring symbol of rebellion and solidarity with the protesters, who have fought for the past 14 weeks against what they say is the authoritarian creep of the Chinese government.
Protesters say the walls are a way for protesters to express themselves. “Lennon walls are our voices,” Jessica, an artist who contributes to the walls, told the BBC “That’s how we encourage each other.”
A crowd-sourced map suggests there are now about 150 Lennon walls throughout Hong Kong. There are even protest walls in Australia.