"At one time or another Guston has met with all the contradictions in the modern tradition (The art of painting in the twentieth century has careened wildly between extremes..). Like most complex artists, he has had several relationships with his time, and those not always exclusive. Yet certain of the inherited problems in his case have found more or less consistent answers, as for instance in the problem of content. Can matter alone carry expressive meaning? He says no. It is not enough to make a mark on a canvas, even if it creates radiant light or rhythmic sequence. Although he experiments constantly, his final answer is no, paint alone is not enough. As for the problem of space as posed in our time: Is the canvas really a two-dimensional surface whose frontal plane must not be violated? - Guston again answers no. The modern shibboleth of planarity is not enough. He has devised means to suggest depth, complicated perspective, close-ups, and he has used tonal modulation to find fresh spatial illusions. He refuses to reject the long history of painting as an art of spatial illusion."