Comments: Museu de l'Empordà is well known for its interest to relate art with other cultural disciplines as literature, philosophy, etc. "Complementaris" is a serie of dialogues between art and science. We used two complementary colours (green and red) in two different and overposed layers. The reader uses a red filter to separate the two informations. In some way we forced to use a physical experiment to read the text. It was our particular way to connect art and science.