Functional Performance of Light and Shadow in Islamic Architecture

Abstract

Light and shadow constitute fundamental environmental mechanisms in Islamic architecture, where they were employed as practical tools for climatic adaptation and functional optimization. Rather than serving decorative or symbolic purposes, the use of shading, controlled daylighting, and filtered openings enabled historic Islamic buildings to achieve thermal moderation, enhance natural ventilation, regulate visual comfort, and maintain privacy within hot and arid environments. This research examines the functional performance of light and shadow through four representative case studies: the Umayyad Mosque in Damascus, the Mustansiriya School in Baghdad, al-Azhar Mosque in Cairo, and the Süleymaniye Mosque in Istanbul. Using descriptive and analytical methods supported by ArcGIS thermal simulations, the study evaluates temperature variations between sunlit and shaded zones at different times of day to assess their impact on environmental comfort and spatial usability. The results confirm that courtyards, arcades, mashrabiyas, domes, and controlled openings formed an integrated passive system that reduced heat gain, stabilized interior microclimates, improved airflow, and decreased reliance on mechanical cooling. These findings validate the hypothesis that light and shadow in Islamic architecture functioned as deliberate climatic strategies, enabling buildings to respond effectively to their environments. The study concludes that the environmental logic embedded in traditional Islamic architecture offers valuable lessons for contemporary sustainable design, particularly in developing passive solutions that enhance thermal performance, energy efficiency, and climatic adaptability