A cloak of invisibility

As Christmas is upon us, allow me to share some childish wonder and dreaming.

We learned about the invisibility cloak from Harry Potter. As with many cool ideas, the myth of invisibility started in ancient Greece. The gods Hades (underworld), Athena (wisdom, battle, handicraft), Hermes (messenger), and Perseus (slayer of Medusa) were all purported to have carried a helmet that made them invisible.