 (See Japonism) Cassatt was attracted to the simplicity and clarity of Japanese design, and the skillful use of blocks of color.In her interpretation, she used primarily light, delicate pastel colors and avoided black (a "forbidden" color among the Impressionists).Adelyn D. Breeskin, the author of two "catalogue raisonnés" of Cassatt's work, comments that these colored prints, "now stand as her most original contribution... adding a new chapter to the history of graphic arts...technically, as color prints, they have never been surpassed".