In her lively book on modern art, Mrs. Kuh finds its most constant characteristic to be break-up -- of light, form, Chronology, space, surface. Break-up does not mean a lack of discipline, nor is it always a symbol of destruction: it is rather that artists are developing a new art for a new age. Except for a brief introduction, the book is built around the 95 plates, each discussed separately, insightfully and often brilliantly. The comments are usually brief, but the vastly broadened scope of modern art, with its power, vigor, wit and despair, is impressively conveyed. Break-up is not a sufficiently complex idea to explain all recent art, but within its limitations we are led to look at it anew-- and at our culture as well. An excellent teaching book.