Banksy - Notice that the man has a stethoscope to check the heart in 'I heart ny'. Checking it for illness? Irregularities? Though Banksy is arguably the greatest street artist to date, it is this sort of social commentary that makes Banksy truly phenomenal.
banksy uses stencil art, he cuts out a stencils and places it on his desired srface then spray paints it. his art can be found in disney land, bristol, london, san fransisco and LA. http://en.wikipedia.org/wiki/Banksy http://blog.virgin-atlantic.com/t5/Our-Places/Street-Art-Banksy-in-London-Los-Angeles-and-San-Francisco/ba-p/900