The controversial sculpture Alison Lapper Pregnant by Mark Quinn inf Trafalgar Square, London. The fourth plinth, on the northwest corner of the square, was intended to hold a statue of William IV, but remained empty due to insufficient funds. Later, agreement could not be reached over which monarch or military hero to place there. In 1999, the Royal Society of Arts conceived the idea of the Fourth Plinth Project, in which the plinth is occupied by a succession of works commissioned from contemporary artists. Quinn's Alison Lapper Pregnant is a 3.6m marble torso-bust of Alison Lapper, an artist who was born with no arms and shortened legs due to a condition called phocomelia.