Few ancient structures inspire spiritual reverence and architectural awe like the Roman Pantheon. Designed as a temple and a cosmological instrument, the Pantheon depicts how Roman architects transformed daylight into a divine symbol. This paper examines the spatial arrangement of light and shadow in the Pantheon. It analyses the design elements, such as the oculus, dome, coffers, and niches, work together to create a sacred atmosphere that aligns with Roman cosmology and ritual. Deeply immersed in the spatial dynamics between the architectural elements and phenomenological impact, the research explores the movement of sunlight within the Pantheon and its effect on the interior volume of space. Sunlight, which shifts throughout the day, animates different parts of the space, transforming physical architecture into a living symbolic environment. This paper examines the Pantheon as more than a mere feat of engineering. Analyzing its architectural expression, ritual context, and religious symbolism, it positions the structure as a spatial articulation of metaphysical ideology. The oculus serves not just as a structural opening but as a medium through which cosmic time and spiritual alignment are expressed. The findings further demonstrate how the careful calibration of daylight can elevate the architectural experience, imbuing it with a sense of sacred resonance.

Keywords - Pantheon, Roman architecture, sacred spatiality, daylight symbolism, phenomenology

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