Natural scenes generally vary in the number of different visual elements they contain. According to psychological theories, differences in landscape complexity play an important role in determining landscape preference. Psychological theories have described landscape preference as a function of two basic needs: a need for understanding the landscape, and a need for exploring the landscape (e.g. Appleton, 1975; Ulrich, 1983; Kaplan & Kaplan, 1989). Complexity is assumed to be an important characteristic in fulfilling exploration needs. Thus, as landscapes are higher in complexity, they may offer more opportunities for exploration.