The Call of Light is an off-grid retreat overlooking the freshwater of Lake Qarun in Fayoum, Egypt, designed for an albino man and his wife who embrace a life free from electricity and digital technology. Inspired by the religious concept that prayer is prescribed at appointed times, the house transforms architecture into a silent call to prayer. Instead of clocks or electronic reminders, precisely calculated openings, aligned with the sun's path and Fayoum's latitude, project focused beams of sunlight into the interior at the exact times of Noon, Afternoon, and Sunset. The light strikes a shallow water channel embedded with crystals that came from Fayoum's Crystal Mountain, creating shimmering reflections that gently announce each prayer. A dedicated tower captures the first light of dawn to mark its prayer, while Isha is observed in the tranquility of the night. Constructed from locally sourced white rammed earth from the nearby White Desert, the house blends naturally with its landscape while providing exceptional thermal comfort. Spaces for prayer, poetry, reflection, and a tranquil pool encourage a slower, more mindful way of living. The Call of Light demonstrates how architecture can become an educational instrument, teaching astronomy, sustainability, local craftsmanship, and spiritual awareness by replacing technology with the timeless language of sunlight, earth, water, and stone.