Plot: The show comes from the Tate Modern on London's Bankside, home to A Bigger Splash, a new exhibition taking a new look at the relationship between performance and painting. Alastair Sooke meets Elena Palumbo, muse and model for Yves Klein, to find out what it was really like to be a 'living paintbrush' for one of the most influential avant-garde artists of the post-war period