This volume throws light upon an art expression to be found clad in the garments of Moroccan architecture. This work provides keys to the understanding of geometrical arabesques. This art of a rare and precious mastery was elaborated through the determined efforts of generations of anonymous artists. A brief historical survey defines the specificity of Islamic art in Morocco. Three principal styles of decorative architecture are studied : calligraphy, floral arabesque, and geometrical arabesque. Illustrations and photographs of some of the most beautiful sites of Morocco (monuments, royal palaces and cities) are a pleasure for the eye.