The first known representation of a square sail - At the end of the Naquada period there is one last superb pot (now in the British Museum); it carries a plain, careful picture of a ship with a square sail. One theory is that the pot depicts a foreigner - the square sail is sometimes used in heiroglyphics to denote a stranger - and that it records the advent of a visiting ship from the Persian Gulf, the end perhaps of the first foreign-going voyage. It may be so. Naquada was a small town on the bend of the Nile where the ancient track came over the mountains from Quseir by way of the Wadi Hammamet.