Image Details: ‘Knitta-Please-Bike’ by dandeluca, via Flickr. Banksy does grafitti. He’s done a reasonably good job of making a career out of it too, over the past 20 years or thereabouts. Banksy’s stencils feature striking and humorous images, occasionally combined with slogans. The message is usually anti-war, anti-capitalist or anti-establishment. Subjects often include rats, apes,…