Threshold is an in-depth look at a pivotal decade in the career of Anne Truitt (1921-2004): the 1970s. An authoritative essay by acclaimed art historian Anne M. Wagner delivers new insights into the artist and her work, while extensive excerpts from the artist's writings--including some previously unpublished--open a new window on Truitt's creative process and its preoccupation with perceptual experiences that hover along an invisible edge--a threshold, as Truitt often called it, or "the point at which the abstract nature of events becomes perceptible." In the 1970s this idea was an ongoing preoccupation, which she repeatedly attempted to define. The plates section includes generous illustrations of works from the period, including drawings, paintings and the sculptures for which she has been heralded as a key figure in postwar American art.