The love of ‘formulae’, that is, of formal syntheses which are both concise and rich in possibilities, is characteristic of every sacred art. Buddhist iconography is made up of type images of this kind, and the same is true of Hindu and Taoist art, as well as of the icons of the Eastern Church , whose colouring and composition are fixed by tradition. In each case the imagination of the individual artist is subordinated to the traditional model; his imagination is free only in an inward sense in that he endeavours to attain to the spiritual kernel of his model and to remake the image from that. In the case of Islam, it is in architecture and ornamentation that one must look for the formulae of prototypes which the artist ceaselessly reproduces and varies according to circumstance. These prototypes are inexhaustible because they are true.
This fidelity to models, which religion does not actually prescribe but which the consensus of believers has in a sense consecrated, has earned for Islamic art the stigma of being the victim of ‘stagnation’, as if its stability over the centuries had been the result of inertia or lack of awareness. In reality, the alternatives of stagnation are highly inapplicable to sacred art, which is either faithful to its principles, and hence active and aware, or forgetful of them, thus entailing decadence and collapse.
Titus Burckhardt, Art of Islam: Language and Meaning, 1976