This study is to examine the meanings of center and margin which can be researched from the main character of Joe Christmas in Light in August, one of the greatest novels by William Faulkner. The human subjects have a tendency to change or elevate the state of marginality into realm of center within cognitive limitation of themselves. If marginality is the object of overcoming from the tension of center, two ways of subjugating the marginal area are to be possibly attempted. One is to step forward from margin to center. Another is to dismantle the concrete border between center and margin. While reading the novel we can glance at the dual or polar images, and binary oppositions which are characteristics of Joe Christmas but mostly vague in the novel. His nebulous and withholden identity produces the effect of going beyond the distinction of center and margin or the differentiated realms of center and margin. The identity of his fluidity freely comes and goes over the established and confined line by floating boundaries between "other" and "subject". He is the symbolic image of reciprocality between the black and white. His bloodline is not easily revealed due to his unclear ancestry. Consequently ambiguity of Joe Christmas is interpreted as the mechanism to demolish the establishment of center and margin, and the realms of "other" and "subject". Even his death involves more extensive and transcendental characteristics of trespassing between center and margin in that his emasculated body signifies "the body without organs" which can be the basis of subverting the firmly settled recognitive frame of society.