It was while the artist was on holiday in the south of France that he began to use picture postcards in his collages. He was attracted by their bright colours and found that, using a number of the same cards together, he could transform their original meaning. In this piece Penrose has shown a woman looking into a mirror. As the title suggests, he has used postcards of the Mediterranean Sea. The collage also includes rubbings, at the bottom, and drawing in pencil.