The Mosque Plan: Qibla, Mihrab, Minbar, Minaret

Prayer in a mosque is physical: rows of worshippers stand, bow, and prostrate together, facing the same wall at the same time. That rules out pews and altars. What the room needs instead is open floor and a fixed direction, the qibla, meaning the direction toward the Kaaba in Mecca. From any city on earth, the qibla is worked out using that city's latitude and longitude relative to Mecca's, the same way you would calculate a compass bearing to a distant point on a globe rather than just pointing toward Arabia on a flat map. The qibla wall gets marked by a mihrab, a niche shaped like an arched doorway but cut into solid wall with nothing behind it. It borrows a doorway's form without its function, framing the direction of prayer rather than opening a passage. Beside the mihrab sits the minbar, a raised stepped pulpit for delivering the Friday sermon, and outside, a minaret, a tower from which the call to prayer is announced.

Two plans organize this around a courtyard. The hypostyle mosque spreads a flat roof over a forest of columns, multiplying identical units to hold a large congregation, with the qibla wall at one end. The four-iwan mosque instead faces four vaulted, arch-framed halls across a central courtyard, one iwan larger and aligned with the qibla, so the courtyard itself becomes a space of axial confrontation rather than a field of repeated columns.

The Great Mosque of Isfahan shows a mosque plan is not fixed once but built in layers. Begun as a hypostyle mosque under the Abbasids in the eighth century, it was reworked into a four-iwan plan under the Seljuks by the eleventh and twelfth centuries, with later Safavid tilework added in the fifteenth through seventeenth centuries, each dynasty building onto what came before rather than starting over.