In 1920-1930s saw more changes in the industry. The industry of comic anthologies in Britain had turned to attracting children adopted a magazine size comic through juvenile humor, with The Dandy and The Beano launched. In Belgium, Hergé created the The Adventures of Tintin newspaper strip for a comic supplement and the same time in the United States had seen newspaper strips with action, adventure and mystery strips in1929. The first earlier adventure strip was Tarzan begun in 1929, whose Canadian born cerator Harold Foster emphasized realism, composition, and drawing based on the techniques of commercial illustration.
A market for such comic books have become the largest and most influential iconographic field in history, with literally millions of discrete pictures produced since 1900, and by 1938 publishers were printing original material in the format.
During the latter half of the 20th century comics have become a very popular item for collectors and has pushed the marketing of comics characters to the extreme.