In middle age Pablo Picasso became enraptured by Marie-Thérèse Walter, a young woman he had met on a Parisian street. The Art Channel visits Tate Modern’s exhibition to understand how Marie-Thérèse became Picasso’s muse. How did his infatuation for her inspire his art? Grace Adam and Joshua White investigate why Picasso’s images of 1932 are challenging and unforgettable.