Farouk El-Baz
Egyptian geologist Farouk El-Baz has suggested that the head of the Sphinx may have been carved first, out of a natural yardang, i.e. a ridge of bedrock that had been sculpted by the wind. These can sometimes achieve shapes which resemble animals. El-Baz suggests that the "moat" or "ditch" around the Sphinx may have been quarried out later to allow for the creation of the full body of the sculpture.