'Gift Horse', a skeletal horse sculpture by German-American artist Hans Haacke, is seen on the fourth plinth in Trafalgar Square in central London, March 5, 2015. The bronze structure, weighing 1 700 kilograms and over 4.5 metres high, is the tenth commission for the plinth space. REUTERS/Toby Melville (BRITAIN - Tags: ENTERTAINMENT CITYSCAPE TPX IMAGES OF THE DAY SOCIETY)