Vik Muniz is a Brazilian born artist who's been living in New York since the early 80s. He's a recent discovery for me, but I have become quite interested in his works of late, especially his conceptualisation of illusion and truth. His final medium is photography, but his work is much more than photography. He's also a great raconteur as the video below testifies, a rare thing in the art world.
Vik Muniz's TED talk +