Michael Craig-Martin looks back at some of his key works

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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. Looking back over his long career he explains why the same ideas drive him today as when he first started out.