Some believe that his stencilled graffiti provides a voice for those living in urban environments that could not otherwise express themselves, and that his work is also something which improves the aesthetic quality of urban surroundings; many others disagree, asserting that his work is simple vandalism (a claim made by at least Peter Gibson, spokesperson for Keep Britain Tidy), or that his (apparently left wing) beliefs are not shared by the majority of the inhabitants of the environments that he graffitis. This political purpose behind his vandalism is reminiscent of the Ad Jammers or subvertising movement, who deface corporate advertising to change the intended message and hijack the advert.
In 2004 the Space Hijackers gave out spoof vouchers outside a Banksy exhibition to highlight the artist's ironic use of anti-capitalist and protest imagery while doing work for corporations and art galleries.
Another of Banksy's tricks involved hanging a piece of his own art in London's Tate Modern, and as of March 2005, the New York Museum of Modern Art, Metropolitan Museum of Art, the Brooklyn Museum, and the American Museum of Natural History. In May 2005 Bansky's version of primitive cave painting depicting a human figure hunting wildlife while pushing a shopping cart was found hanging in the British Museum.
On 4 August 2005, the BBC reported that Banksy had painted 9 images on the Palestinian side of the Israeli West Bank barrier, including an image of a ladder up and over the wall and an image of children digging a hole through the wall
Banksy has also self-published several books that contain photos of his work in various countries as well as some of his canvas work and exhibitions, accompanied by his own subversive and often witty writings. His first book, published in black and white, is Banging your head against a brick wall followed by the full color Existencilism. In 2004 he published his third book, Cut it Out, and 2005 saw the publication by Random House of Wall and Piece.