Basically, works on Twombly seem to come and go out of print, and become rather pricey collectors items quickly. This book contains an excellent selection of reproductions, including foldouts, of all phases of his career. The only thing that prevents this from being a five star book is the rather pedestrian (although well researched) text, in the usual obfuscating artspeak that passes for deep insight today. The out of print Varnadoe book from the major restropective of the 90's has a far more lucid outline of the works in question...but, really, you're probably buying the book for the reproductions anyway, and there are plenty of them, including some nice full page close up details of the often massive works. Not an inexpensive book, but well worth it for anyone interested in this "painter's painter" works.