Begun in 1974, Incomplete Open Cubesis a sophisticated and elaborate expression of conceptualist art-making by Sol LeWitt, one of the most influential abstract artists of his generation. No other serial project by LeWitt or his contemporaries embodies with such eloquence so many of the central artistic concerns of the period. Incomplete Open Cubesexemplifies the deployment of a single idea to become, in LeWitt's words, "a machine that makes the art."...