Serial imagery is the repeating of one image in many variations or forms. It is a central idea in modern and contemporary art. It can take several forms. A portrait can painted in differing hues and backgrounds with subtle changes to the subject as in Van Gogh's L'Arlésienne and Claude Monet’s Rouen Cathedral Another type is where the same subject is painted at different times of day or seasons of the year for example Claude Monet in his Poplars, Haystacks. The same subject may also be rendered in different mediums, and in different poses, thus, the practice of underpainting may be considered a form of serial imagery even if the image is lost in the completed work. It is common in photography where multiple exposures at varies angles are taken with different lenses etc. in search of the desired effect. It is also used in literature, especially poetry.