Looking back over his long career, artist Michael Craig-Martin explains why the same ideas drive him today as when he first started out.
In the early 1970s Michael Craig-Martin created his famous sculpture An Oak Tree. The work consists of a glass of water standing on a shelf. On the wall next to it a text by the artist argues that, despite what your eyes tell you, the glass of water is in fact an oak tree.
In the spirit of Duchamp, Craig-Martin provokes questions about what we understand to be art and unpicks the relationship between a real object and its depiction.
More info: http://www.tate.org.uk/art/artists/michael-craig-martin-955
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