A physiogram is a photographic image created by moving a controlled point of light over a light-sensitive emulsion. This technique produces intricate patterns and abstract designs based on the motion and intensity of the light source during exposure.
Physiograms have been used by photographers and artists to explore the creative possibilities of light and motion without traditional subjects or cameras. The method allows for unique visual effects, making it a popular choice for experimental and artistic photography that emphasizes form, rhythm, and the dynamic interplay of light and surface.