The arts of manuscript illumination and calligraphy in the Iranian-Islamic tradition transcend technical craftsmanship, serving as visual manifestations of philosophical thought, aesthetic principles, and sophisticated geometric systems. Within this artistic tradition, the twelfth century AH witnessed a major turning point with the emergence of Darvish Abdolmajid Taleghani, whose exceptional mastery elevated the Shekasteh Nastaliq script to its highest level of artistic maturity. In his surviving muraqqaʿāt (calligraphic albums), illumination is not merely an ornamental addition but an essential visual component that establishes a coherent aesthetic relationship with calligraphy and plays a fundamental role in the viewer's perception of beauty. Nevertheless, explaining the mechanisms through which this aesthetic experience is formed requires a theoretical framework capable of relating the formal characteristics of the artwork to the cognitive processes of visual perception.

This study aims to examine the aesthetic function of illumination motifs in Taleghani's works through the theoretical framework of Ibn al-Haytham's theory of visual perception as presented in Kitāb al-Manāẓir (Book of Optics). According to Ibn al-Haytham, visual cognition is achieved through the perception of twenty-two "particular meanings" (maʿānī juzʾiyyah), including light, color, shape, position, similarity, continuity, proportion, and other perceptual attributes, which are analyzed by the discerning faculty (al-quwwa al-mumayyiza). Beauty, therefore, is understood not as an inherent property of an object but as the outcome of an organized perceptual process through which these visual attributes are cognitively integrated and evaluated.

The principal research question investigates how the visual elements of illumination in Taleghani's works contribute to the realization of aesthetic perfection when interpreted according to Ibn al-Haytham's physical and cognitive model of vision. Employing a descriptive-analytical methodology with a comparative approach, the research draws upon library-based sources and the systematic visual analysis of selected illuminated calligraphic compositions to identify correspondences between artistic structures and perceptual principles.

The findings demonstrate a significant degree of compatibility between the structural organization of illumination motifs and Ibn al-Haytham's perceptual framework. Decorative components—including gilding, ruled borders, contouring, ornamental patterns, and chromatic compositions—closely correspond to perceptual principles such as rhythm, harmony, symmetry, balance, proportionality, and texture, thereby facilitating aesthetic perception. However, visual features associated with three-dimensional space and depth representation do not consistently conform to the mathematical and optical principles proposed in Ibn al-Haytham's theory. Beyond describing formal artistic characteristics, this study argues that integrating classical Islamic theories of perception with the analysis of traditional Persian arts provides a productive interdisciplinary framework for reinterpreting the intellectual foundations of Iranian art and offers a deeper understanding of the cognitive mechanisms underlying aesthetic experience.