"Now the photographer unpacks camera and case,
surveying the deep country, follows discovery
viewing on groundglass an inverted image."
                                                                -Muriel Rukeyser, "The Book of the Dead"

"If in all ideology men and their circumstances appear upside-down as in a camera obscura, this phenomenon arises just as much from their historical life-process as the inversion of objects on the retina does from their physical life-process."
                                                       -Marx, The German Ideology