During the early decades of the 20th century, Modern photography emerged through the experimentation of photographers and their questioning of the camera's functions. Photographers began redefining photography's role among the arts and exploring new visions that broke from tradition and convention. This led to photography's revitalization and recognition as an independent art form with its own characteristics. Key figures like Alfred Stieglitz helped establish Modernist principles and ideals for photography through galleries and publications, influencing other artists and critics. Modern photography developed from many sources and individuals, not as a single movement, helping transform it into a major art form of the century.