"The camera, so far as I have been able to discover, is never a prop in any of her sparsely furnished spaces. There are not even overlooked signs, like a telltale cable, except in the very early picture Self-Portrait at Thirteen, taken when she could have been as old as 17, judging by the date. It is a self-portrait as a 13-year-old girl, whose chief feature is her hair, which covers all her other features, and whose most conspicuous garment is a cable-knit sweater. It is a cable-knit image: The cable is deliberately left in the print to make the pun. Francesca was as fastidious about planting signs and meaning as a Flemish master. If there were so much as the shadow of a camera, it reflected an artistic decision. As it is, the photographic apparatus is always external to the image, though certainly internal to her life."
~ Arthur C. Danto