This study reconsiders the perplexing abstract art of the American artist Richard Tuttle (b. 1941) by arguing that Tuttles practice is a paradoxically serial one. As the first to insist upon the serial nature of his art, this study contends that since the beginning of his career in the mid-1960s, Tuttle has worked almost entirely and deliberately in series, producing at least three hundred series in a variety of media and demonstrating a commitment to serial art that is unrivaled within postwar art. While the term series has been used casually to describe some of Tuttles projects, examinations to date have yet to interpret Tuttles oeuvre within a framework of seriality, perhaps because Tuttles series confound the rigidly systematic conventions of postwar serial art that yielded logical order, sequences and, in some cases, predictable conclusions. Although at times Tuttles series employ identical materials and similarly formed objects, quintessentialfeatures of conventional serial logic, his series do not follow discernible patterns but rather appear unfinished and willfully unresolved, as if each object within the series represented a new and different moment in a provisional unfolding. Furthermore, the last object of any given series appears to be an arbitrary end, an abrupt break in the series that might have continued. Consequently, Tuttles serial art can be said to privilege uncertainty and irresolution. Hence this dissertation argues that Tuttles seriality images a serial process that is purposefully and perpetually in-between beginnings and endings. This study also examines Tuttles serial art within the broader framework of art historythe origins of art in antiquity and the Renaissance, the legacies of abstraction, and various movements in postwar art, namely Minimalism, Postminimalism, and Process Art. As this study contends, Tuttles serial art functions as a form of philosophy, and it establishes important affinities between Tuttles seriality and its philosophical counterparts, such as the processual and generative philosophy of Gilles Deleuze.