However rich it may be, (Islamic) ornamentation never destroys the simplicity, not to say the sobriety of the architectural whole; such at least is the rule that is observed in all ages and milieu that are not decadent. In a general manner the architectural whole manifests equilibrium, calmness and serenity.
Titus Burckhardt, from The Void in Islamic Art
Source: bookofkhidr.com