Answer
Henri Matisse was not part of Pissarro's circle of friends and associates known as the'Neo-Impressionists' or'Divisionists.' This group was active in the late 19th century and included artists such as Georges Seurat, Paul Signac, and Camille Pissarro. Matisse, on the other hand, emerged as a prominent figure in the early 20th century and was associated with different artistic movements, including Fauvism and Expressionism.