In the ancient Egyptian measurement system , the Eye Of Horus defined an Old Kingdom rounded off number one ( 1 ) = 1\/2 + 1\/4 + 1\/8 + 1\/16 + 1\/32 + 1\/64 , by throwing away 1\/64 . In the Ancient Egyptian measurement system , the Eye Of Horus defined Old Kingdom number one ( 1 ) = 1\/2 + 1\/4 + 1\/8 + 1\/16 + 1\/32 + 1\/64 , by throwing away 1\/64 for any rational number .