In recent years, text in art has become increasingly popular. Martin Firrell was the first artist to create a contemporary artwork commissioned by St Paul's Cathedral.
Martin Firrell attempted - with the use of public responses, interviews with academics and his own thoughts - to answer the question "What makes life meaningful and purposeful?"
Ed Ruscha said he originally wanted to be a sign painter or make books but came to despise advertising and embraced the fine arts. His knowledge of both disciplines is obvious in his art.
Ed Ruscha said his art came from some form of "involuntary reflex" and so "would see one word and have to make art around it".
Barbara Kruger has focused on graphical forms and text for her entire career. In her installation at Lever House in New York, the rooms themselves have become a canvas for her message.
John Baldessari often uses irony or absurdity in his work and set out, he told Artnet magazine, to "break the certain 'no-no's' and 'taboos' for galleries".
Pure Beauty is one of the first pieces John Baldessari produced after announcing he was cremating all the artworks he made between 1953 and 1966.
Keith Tyson is fascinated with how science, literature and art can relate to each other. Here each phrase, symbol or chemical formula relates to the other ones closest to it.
Fiona Banner uses text to provide exacting descriptions and interpretations. In this work, she documented the car chase in the Steve McQueen film Bullitt as she was worried there were no great literary car chases.
Texting Andy Warhol - An Exploration of Writing in Art is broadcast Thursday 22 October, 1130 BST, on BBC Radio 4.
What are these?