A good photograph is one where a balance, effective for the narration, is reached in the struggle between light and darkness. The balance must be searched for before the pressing the shutter release. The photograph should be the final result of a thought, of an initial idea brought to a conclusion through the perfect knowledge of what that particular light produces. Light has an infinity of nuances, just like sound. The image is a portion that people will see of the reality we have in front of us before we press the shutter release.Within the frame objects can create a positive space if properly lit or a negative space if in the shadow.The negative space has its own power in the narration too. This book tries to make photographers understand that a perfect knowledge of light is of fundamental importance for the success of a photographic image.