Now Athena wanted Medusa's head to decorate her own shield, to magnify its power by the Gorgon's terrible gaze. Athena told Perseus where he could find the special equipment needed for his task. "Seek ye the nymphs who guard the helmet of invisibility," she counseled the young hero. And where, Perseus inquired, might he find these nymphs? "Ask the Gray Sisters, the Graeae, born hags with but a single eye in common. They know - if they'll tell you." And where were the Graeae? "Ask him who holds the heavens on his back - Atlas, renegade Titan, who pays eternally the price of defying Zeus almighty." Okay, okay, and where's this Atlas? "Why, that's simple enough - at the very western edge of the world."