Carolingian Debate over Sacred Space, Hardcover by Collins, Samuel W., ISBN 113700259X, ISBN-13 9781137002594, Brand New, Free shipping in the US Retracing the contours of a bitter controversy over the meaning of sacred architecture that flared up among some of the leading lights of the Carolingian renaissance, Collins explores how ninth-century authors articulated the relationship of form to function and ideal to reality in the ecclesiastical architecture of the Carolingian empire.