The document discusses 20 images chosen based on how they depict shape, form, and space. For each image, the author explains how the relationship between the subject, background space, and use of light and shadow come together to define the shape or demonstrate how something is taking form. Elements like different colors, textures, and perspectives are used to distinguish the subject from its surroundings or show how objects relate to each other. Overall, the document focuses on how intentional use of space enhances the shapes and forms depicted in each photo.