This great achievement of the Gothic period in so many fields of art was the natural flowering of the spirit of the time. Life for all was limited in content, education as we understand it meager and ill-diffused, opportunities for advancement for the individual about non-existent. Despite these limitations--partly, indeed, because of them--and despite the physical disorders of the age, there were, none the less, a simplicity and unity of mind and an integrity of spirit that provided the basis for great achievement. The spontaneous and tremendous energy, the inexhaustible fertility that was an inheritance from their Frankish and Germanic forbears were now moulded and controlled by common institutions, by the acceptance of common points of view and the consciousness of unified and fundamental principles of life, the acceptance of an authoritative social system that defined and limited each man's ambitions. All these factors prevented the protracted self-analysis, the aimless criticism, the uncertainties and confusion of individual aims that consume our energies, detract from our will, and impoverish our accomplishments. Theirs was in no sense an ambiguous age; they were conscious of a universal spirit, continuously pressing for expression in art which could fortunately forge straight ahead to objective embodiment. The stimulation of all of the arts had come in part, too, from the inrush of culture from the Byzantine Empire, where traditions and riches had been heaping up continuously ever since the Greek civilization had at its height spilled over into the East. Every flood-tide of culture is created by various streams of ideas and customs that have for generations taken separate courses. All competent ethnologists are agreed that, no matter what the native equipment of a people is, no matter how abundant are their natural resources, how friendly and encouraging is their environment or how threatening and stimulating, one stream of culture flowing alone never rises to great heights. Invention, evolved organization, and artistic production come only with the meeting and mingling of ideas and habits. The East had first fertilized European intellectual creativeness when the numerous Crusades and the sacking of Constantinople by the Franks brought a wealth of novel and exciting ideas into France and the neighboring territories in the XIth and XIIth centuries. There followed the great period of cathedral-building with all the minor accompanying artistic developments of the sculpture, the glass-painting, the manuscript illuminating, the enameling, the lyrics of Southern France, and the romances and fabliaux of Northern. This tide was ebbing slowly when a second rush from the East incident to the fall of Constantinople in 1453 lifted it again. The art of tapestry was especially sensitive to this second Byzantine influence. The industry was coming to its height; the demand was already prodigious, the prices paid enormous, the workers