Longing and whimsy, innocence and experience, irreverence and wit,

as well as a penchant for the purely zany, coexist in Banksy’s work. 

Will Ellsworth-Jones  (Smithsonian Magazine)

https://www.smithsonianmag.com/arts-culture/the-story-behind-banksy-4310304/ 

In October of 2013, Banksy became 'Artist in Residence' for the City of New York. An honor so prestigious, but he made it up and awarded it to himself! Banksy began a one-month “show on the streets of New York,” for which he opened a separate website and Twitter account. Each day of the month in October 2013, (barring those where “police activity” scuttled his plans), Banksy created works at random locations around the city — often in the form of satirical messages stenciled on walls. Banksy even provided an audio-guide available on a toll-free number for each work created, as if each of those works were part of a curated exhibit within a museum with audio-guides. Each piece drew hundreds of curious onlookers as it was discovered. 

Now, the question is, what ever happened to all that art? Almost all of it is gone. The majority were defaced by other graffiti artists within a few hours. The only pieces that survive are the ones that were immediately protected. 

While the value of Banksy’s pieces soars, a poignancy attends some of Banksy’s creative output. A number of his works exist only in memory, or photographs or coexist with other artists work.