By 2000 Banksy had turned to the art of stencilling after realising how much less time it took to complete a work. Banksy claims they changed to stencilling while hiding from the police under a rubbish lorry, when they noticed the stencilled serial number and by employing this technique, they soon became more widely noticed for their art around Bristol and London.

Banksy displays their art on publicly visible surfaces such as walls and self-built physical prop pieces. Banksy does not sell photographs or reproductions of their street graffiti, but art auctioneers have been known to attempt to sell the street art on location and leave the problem of its removal in the hands of the winning bidder. [from wikipedia]