Salah, meaning ‘prayer’ or ‘supplication’, is also known as Namaz among non-Arab Muslims. Salah is one of the five pillars of Islam, which form the core beliefs and practices of the religion.

The Thomas Walther Collection—341 photographs by 148 artists—represents the innovative vision of the 1920s and ’30s, a transformative period of modern photography and the foundation of our photo-based ...