Photography and the art of chance William Henry Fox Talbot and his picture machine Defining art against the mechanical c. 1860 Julia Margaret Cameron transfigures the glitch The fog of beauty c. 1890 Alfred Stieglitz moves with the city Stalking chance and making news c. 1930 Frederick Sommer decomposes our nature Pressing photography into a modernist mold c. 1970 John Baldessari plays the only game in town