As part of the "Renaissance of Portsmouth Harbour" Millennium project, a large sundial, known as the Millennium Timespace, was installed on the harbour front in 2000. Its timekeeping is partially restricted each day by shadowing caused by large tower blocks either side of the 'timespace'. These towers, Seaward Tower and Harbour Tower, were built in 1963. Their surfaces are covered in mosaic murals designed by Kenneth Barden that rise the full height of the buildings and are illuminated at night. They were controversial initially but are now a tourist attraction. The tiles were produced by Poole Pottery. The International Festival of the Sea drew over 250,000 tourists to the Portsmouth Harbour area in 1998, 2001 and 2005. The most recent festival was held in 2007.