After Cassatt's parents and sister Lydia joined Cassatt in Paris in 1877, Degas, Cassatt, and Lydia were often to be seen at the Louvre studying artworks together. Degas produced two prints, notable for their technical innovation, depicting Cassatt at the Louvre looking at artworks while Lydia reads a guidebook. These were destined for a prints journal planned by Degas (together with Camille Pissarro and others), which never came to fruition. Cassatt frequently posed for Degas, notably for his millinery series trying on hats.