Wales's great artist Sir Kyffin Williams talks about four seminal turning points in the course of his life. Sir Kyffin's Welsh upbringing, viewing a 15th-century Italian fresco by Piero Della Francesca, and a 1947 realization he might be able to earn his living as a painter - these are the first three. The fourth moment was an agonizing choice between Patagonia and Venice. He had spent two exciting months on a Winston Churchill Scholarship in Patagonia, and first visited Venice in 1955. The extraordinary Italian city's magnificence and lack of inhibition had cast a spell during each of his subsequent visits.