Alexander Marshack single-handedly revolutionized the field of Paleolithic art research. His astounding photographs of portable art objects caused us to see them with fresh eyes, to ask new questions, and to understand their technology and production far more precisely; and his pioneering use of infrared and ultraviolet light in the caves revealed startling new facts about the paintings. In addition, he carried out important, provocative and challenging work on archaeoastronomy, calendar sticks, female imagery, and other topics. Alexander Marshack was able to do what nobody else ever had before, or perhaps ever will again - i.e. travel all over Europe, visiting not only many decorated caves but also all the portable art objects scattered throughout the continent, including Russia. This unique experience and knowledge, together with his unrivalled and amazing documentation of all this material, made him by far the USA's foremost specialist in Paleolithic imagery. To honor his memory, in this book, scholars from many parts of the world contribute papers about some of the many problems that interested him and to which he made such a massive contribution.