A non-linear essay on the color blue. The sky is blue and so is the sea (sometimes). Yves Klein worked with this color, the night falls in a blue coat, blue can heal, but it can also mean mishap. The color was treated by writers, filmmakers and philosophers. It became part of many myths: a never-ending topic. Blue is the favorite color of half of the world's population. This video is sophisticated, artful and playful — a melange of associations, information and reflexions. It is stunning because of its enormous variety of content and form.