Descriptions in which humans and machines are equated abound in the beginning pages of Light in August. The purpose of these comparisons appears manifold, including both the more obvious commentary on work and automation and an engagement with the maintenance of social roles. Among the entities we are introduced to in the beginning portion of the novel are the various machines that may be left behind once the mill has exhausted the forests in the town of Doane’s Mill, along with its nameless and faceless men:
… some of the machinery would be left, since new pieces could always be bought on the installment plan–gaunt, staring, motionless wheels rising from mounds of brick rubble and ragged weeds with a quality profoundly astonishing, and gutted boilers lifting their rusting and unsmoking stacks with an air stubborn, baffled, and bemused. (4-5)
In Doane’s Mill, in which mill work is the only work available to able-bodied men such as Lena’s brother McKinley, the fates of these men and the machines they work with once they have outlived their usefulness are intertwined. Even Lena’s sister-in-law is reduced to a machine-like existence, stuck in an endless process of childbirth. The mill workers of Jefferson are characterized similarly. Despite the planing mill men’s interest in the arrival of a “foreigner” in the shape of Joe Christmas, they must soon return “to their work among the whirring and grating belts and shafts” (32). Soon enough Christmas himself, with his his “steady back and arms,” becomes one of these endlessly working men, albeit with a “baleful and restrained steadiness” (34). These characterizations recall Caroline Compson in The Sound and the Fury, who, comfortable in her role within the white patriarchy and accustomed to being waited on, calls out to Dilsey “with machinelike regularity” upon waking (Fury 270). Of course, Caroline’s machinelike existence is of a different quality; although associated with the fulfillment of a role typical of the time, it is the role of a wealthy white woman, and the life to which she has developed a mechanical adherence is one of leisure and pampering, unlike the laboring characters peopling Light in August thus far.
Lena, however, shows hope of breaking free from such an existence. She is in some ways a puzzling character, host to contradictory sentiments: she breaks boundaries by traveling alone as a visibly pregnant, visibly unmarried woman but seems to exist in a trancelike state while doing so. It is as if she has pushed her body, at least in the sense of movement from place to place, to break free from her expected role but her mind has not yet followed suit, therefore trapping her in a liminal zone. Her thoughts reveal this state as she reflects on her journey thus far and the people who have helped her: “She waits, not even watching the wagon now, while thinking goes idle and swift and smooth, filled with nameless kind faces and voices:…” (8). In their movement, the mules and wagons that carry Lena on her journey seem to progress in accord with her machinelike progress. While traveling on Armstid’s wagon, for example, his mules “plod in a steady and unflagging hypnosis” (8).

