Io Photo: Bed Time for Argus
When Hera set the giant, Argus Panoptes, to guard me (the heifer-formerly-known-as-Io), Zeus sent Hermes to the rescue. Argus may be an awesome watchman, but he's no match for Hermes's sweet, sleepy music. [Argus, Mercury, and Io by Jacob van Campen, ca. 1630-1640] Public domain.