His work transformed the ukiyo-e artform from a style of portraiture largely focused on courtesans and actors into a much broader style of art that focused on landscapes, plants, and animals. Hokusai worked in various fields besides woodblock prints, such as painting and producing designs for book illustrations, including his own educational "Hokusai Manga", which consists of thousands of images of every subject imaginable over fifteen volumes. Starting as a young child, he continued working and improving his style until his death, aged 88. In a long and successful career, he produced over 30,000 paintings, sketches, woodblock prints, and images for picture books in total. Innovative in his compositions and exceptional in his drawing technique, Hokusai is considered one of the greatest masters in the history of art.