A photogram is a photographic image made without a camera, created by placing objects directly onto light-sensitive paper and exposing it to light. The areas where light hits the paper turn dark, while the areas covered by the objects remain light, resulting in a silhouette effect. This technique allows for creative expression and experimentation with shapes and textures. Photograms were popularized by artists like Man Ray and Laszlo Moholy-Nagy in the early 20th century, showcasing the artistic potential of photography beyond traditional methods. They are often used in art education to teach concepts of light, shadow, and composition.