Hector the Cat eight of his nine lives due to "ignorance of road safety practices". This was followed by a short instructional film. In subsequent years other characters were introduced in calendars, instructional films, and comic books including Millie, his girlfriend (1973), Uncle Tom (1974), Hector and Millie's three kittens (1975) and his space friend Ding Dong (1982). A study in 1978 found that, although children enjoyed the characters and stories, the material had a number of inadequacies. It stressed that road safety research findings and child development theory would need to be considered for any future development. The character is currently used
The Cat in the Hat about it. This is someone who delighted in the chaos of life, who delighted in the seeming insanity of the world around him." Ruth MacDonald asserts that the Cat's primary goal in the book is to create fun for the children. The Cat calls it "fun that is funny", which MacDonald distinguishes from the ordinary, serious fun that parents subject their children to. In an article titled "Was the Cat in the Hat Black?", Philip Nel draws connections between the Cat and stereotyped depictions of African-Americans, including minstrel shows, Geisel's own minstrel-inspired cartoons from early in his career, and the