Kooiker approaches each series as a project. Because he works with series, the definitive value of each individual image is only apparent as part of the whole. With his series of forty blurred photos of a stretch of woodland in which women appear to be peeing in the open air, Kooiker won the 1996 Prix de Rome for photography. This voyeuristic motif is a constant theme in his work and is explored in a playful way in his 'Hunting and Fishing' series (1999): in a lush green landscape we see blurred forms of naked women running away from us.

Sometimes a series may expresses erotic desire, associated with observation; sometimes the emphasis is on the study of models posing in less than erotic positions. As in the 'Model Studies 2001' and 'Showground 2004' series, in which the setting is confined to Paul Kooiker's studio. The result may be beautiful, disturbing, ironic or intriguing, but always personal.