motifs and vivid color schemes applied both to works on canvas, and to increasingly complex installations of wall paintings. An Oak Tree In 1973, he exhibited the seminal piece An Oak Tree. The work consists of a glass of water standing on a shelf attached to the gallery wall next to which is a text using an argument to explain why it is in fact an oak tree. Nevertheless, on one occasion when it was barred by Australian Customs officials from entering the country as vegetation, he was forced to explain it was really a glass of water. The work was bought by the National Gallery of Australia in 1977, and the Tate gallery has an artist's copy. Young British Artists From 1973, Craig-Martin was a tutor at Goldsmiths College and, during the 1980s, was a significant influence on the emerging YBA generation, including Damien Hirst. He was also helpful in promoting the Freeze show to established art-world figures. In 1995 he curated Drawing the Line: a comprehensive touring exhibition on the history of line drawing for the Southbank Centre, London. Craig-Martin and his influence were described in an article in the Observer regarding the mentors of British art, entitled Schools of Thought. Craig-Martin has been a trustee of the Tate Gallery and is a trustee of the National Art Collections Fund. Later work Since 2011, Craig-Martin has been working on powder-coated steel forms that describe everyday objects and appear like line drawings in the air. The first series was shown in the gardens of Chatsworth House in Derbyshire, in 2014, where the sculptures were sunk into the soil of the grounds. Exhibitions Craig-Martin had his first one-man exhibition at the Rowan Gallery in London in 1969. Since then he has shown regularly both in the UK and abroad. He represented Britain at the São Paulo Art Biennial in 1998. His solo museum exhibitions include “Always Now,” Kunstverein Hannover (1998); IVAM, Valencia (2000); “Living,” Sintra Museum of Modern Art, Portugal (2001); “Signs of Life,” Kunsthaus Bregenz, Austria (2006); and “Less Is Still More,” Museum Haus Esters, Krefeld, Germany (2013). He made his American debut in the "Projects" series at the Museum of Modern Art. A retrospective of Craig-Martin's work took place at the Whitechapel Gallery in London in 1989. In 2006, the Irish Museum of Modern Art presented "Michael Craig-Martin: Works 1964–2006" which included works from over 40 years of