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The earliest Nubian architecture used perishable materials, wattle and daub, mudbricks, animal hide, and other light and supple materials. Early Nubian architecture consisted of speos, structures derived from the carving of rock, an innovation of the A-Group culture (c. 3800-3100 BCE), as seen in the Sofala Cave rock-cut temple. Ancient Egyptians made widespread use of speos during the New Kingdom of Egypt.