Focused on twentieth-century art criticism, this chapter shows how critics and essayists such as Clement Greenberg, Rosalind Krauss, Susan Sontag, and Michael Fried addressed the problems of medium and abstraction. The rise in the prominence of the essay on visual art during this period corresponds with the ascendancy of abstract representational painting and sculpture. It is as if the retreat from figuration opened a breach through which language – in the form of the essay – took up the role of advance guard. The essay enacted the experience of visual art rather than merely describing and judging it. In parallel with the proliferation of abstraction, writing on art turned away from representing the art object and toward the production of a self-sufficient experience. Pointing to nothing outside itself, the autonomous abstract work was matched by the essay attempting to become a wholly independent force of intellectual creation. The chapter traces how essayists responded to modernist and abstract art, and elucidates the role this writing played in settings such as art schools, magazines, museums, and other institutions that funded, displayed, and popularized the art of the day.