They used research about child development and young children's viewing habits that had been done in the thirty years since the start of "Sesame Street" in the U.S. This revolutionized the genre by inviting their viewers' involvement. Research was part of the creative and decision-making process in the production of the show and was integrated into all aspects and stages of the creative process. "Blue's Clues" was the first cutout animation series for preschoolers. It looks like a storybook with primary colors and simple construction paper shapes of familiar objects with varied colors and textures.