Calligraphy in Hagia Sophia

Here are some pictures from Hagia Sophia in Istanbul. The building was constructed in Byzantine times as an Orthodox church, became a mosque in the Ottoman era, now it is a museum. The Muslims don't believe in hanging images in mosques but they can hang pictures with calligraphy, properly framed, as pictures should be. This is what we see in Hagia Sophia, huge pictures in exquisite calligraphy in Arabic thuluth style. This was the style that was considered right for monumental inscription at the time of Ottomans.