The wall is one of the major artworks of the Umbrella Movement as a collective artistic work of spontaneous free expression, demanding democracy in the elections of the territory's top leaders.

It was a space of encouragement and solidarity, full of colourful Post-It notes (more than ten thousand pieces) with messages advocating for freedom, democracy and universal suffrage.

"[11] Police arrested a fourteen-year-old girl for drawing flowers on the wall with chalk, threatening her father with removal of custody, and not releasing her back to her family until 20 days later.

[13][non-primary source needed][14] Her lawyer, Patricia Ho, stated that the government response to a chalk drawing was "disproportionate" and that "police are using whatever mechanism they can think of to stop teenagers from participating in any protest.

Meanwhile, those trapped buses and discontinued bus stops became the place where protestors and citizens stuck their opinions of requesting the stepdown of CY Leung and the slogans to call for universal suffrage, which were written mainly on cardboard and papers instead of post tips, which became the prototype for the Lennon Wall in Admiralty.

During the series of protests against the China-Extradition bill beginning on 9 June, the original Lennon Wall has been once again set up in front of the Hong Kong Central Government Offices staircase.

During the months of June and July, Lennon Walls with similar encouraging messages written on post-it notes and regular paper have been put up throughout the entire Hong Kong.

[22] Lennon Walls have also appeared outside of Hong Kong in the cities of: Toronto, Vancouver BC, Tokyo, Berlin, London, Melbourne, Manchester, Sydney, and Taipei.

Police photographed and removed several pieces of paper that allegedly contained the personal information of an officer who, while on duty on 8 July, challenged a peaceful protester to "remember me, and have a fight with me.

[30] On the next day, a pro-Beijing middle-aged man was arrested for physically assaulting two victims, one of which refused to defend himself or retaliate, when he attempted to tear the sticky notes from a Lennon Wall near Kowloon Bay.

[31] In 2019 and after, Lennon Wall installations sprang up around the world in support of Hong Kong protests against a proposed law to allow easier extradition of criminal suspects to Mainland China.