Another essential element of a mosque’s architecture is a mihrab—a niche in the wall that indicates the direction of Mecca, towards which all Muslims pray. Mecca is the city in which the Prophet Muhammad was born, and the home of the most important Islamic site, the Kaaba. The direction of Mecca is called the qibla, and so the wall in which the mihrab is set is called the qibla wall. No matter where a mosque is, its mihrab indicates the direction of Mecca (or as near that direction as science and geography were able to place it). Therefore, a mihrab in India will be to the west, while a one in Egypt will be to the east. A mihrab is usually a relatively shallow niche, as in the example from Egypt, above. In the example from Spain, shown left, the mihrab’s niche takes the form of a small room, this is more rare.