A huge carnival float has been built in Malta as a rather unorthodox tribute to one of the world's most famous architects. Renzo Piano – the designer of The Shard, the Whitney Museum of American Art and the nearly-completed Stavros Niarchos Cultural Centre – was honoured at last week’s Maltese Carnival for his architectural contribution to country’s capital, Valletta. A gigantic smiling depiction of Piano appeared on a special float,