Evliya Çelebi was a 17th-century Ottoman traveler who wrote a ten-volume travelogue, Seyahatnâme. Red Apple uses AI to reinterpret Çelebi's writing on Hagia Sophia, Istanbul's first imperial mosque. "an image of Mother Meryem (the Virgin Mary), holding in her hand a carbuncle as big as a pigeons egg, by the blaze of which the mosque was lighted every night. This carbuncle was also removed in the birthnight of the Prophet, to Kizil Almà (Rome), which received its name (Red Apple) from thence."