While much of Clement's work was first presented in exhibitions, by the 1990s he had turned to books as his preferred medium. Among his many voluminous publications of black and white photographs are Byen bag Regnen. Fotografier fra København (1987), Af en Bys Breve. Fotografier fra Lissabon (1993), Drum. Et sted i Irland (1996), Langs Vinden. Et fotografisk Essay (1998) and Før Natten. Havana (2001). These pictorial essays contain very little commentary, just a few words or place names accompany the photographs.
Clement's photographic work emerges from two traditions: The Scandinavian melancholy and the 'flaneur' tradition from the Parisian school. His work originates from a fertile and imaginative thought process, a stream of consciousness that is clearly evident in his later books, more concerned with capturing a state of mind than with situations. His books are less documentary depictions than subjective moods; somewhere between spectator and reality.