Why were ceramic tiles important in Persian architectural decoration?

In Persian architectural decoration, ceramic tiles were essential for transforming structural surfaces into vibrant, artistic expressions. By the 13th century, the production of wall tiles for both interior and exterior use was well established in Persia, where they served as the primary decorative feature to encrust floors, walls, roofs, and domes.12

These tiles were important for several reasons:

• Aesthetic Enrichment: Architectural form was often subordinated to intricate, richly colored surface decoration. Tiles allowed for the use of brilliant colors, such as various shades of blue ranging from turquoise to deep ultramarine, creating a gardenlike effect through the depiction of naturalistic flowers and interlacing stems.2
• Structural Emphasis: Beginning in the second half of the 12th century, colored tiles were utilized to emphasize the contours of decorative areas within a structural unit, providing a visual definition that complemented the building's geometry.3
• Versatility: Tile mosaics and lustred tiles provided a medium for complex floral and geometric designs, which often mirrored the patterns found in Persian carpets, further unifying the interior design aesthetic.2