“Painting must be used for something other than painting,” said Henri Matisse, who used the medium to portray and understand his daughter, Marguerite. The subject of many of his portraits, Marguerite was the love child of his relationship with the model Caroline Joblau. She was a sickly child, an active member of the French Resistance during her teenage years, and an ardent champion of her father’s work for the rest of her life. In a letter to Henri, she describes herself as being “a girl who adores you and a being who adores your work.” Their devoted father-daughter relationship is now on display in Paris. The chronological exhibition features Matisse’s portraits of his beloved daughter, as well as paintings by the subject herself. —Carolina de Armas