I'm working on a Depaul production of La Calisto this month. The prologue takes place in the "Cave of Eternity." The original script calls for a cave with a serpent eating it's own tail. Instead of that the director asked for some kind of glowing floating orbs that would signify a kind of void or purgatory. These orbs took me all day long, but I'm really happy with them. I made them using a combination of optical flares, echo effect, and ripple effect. I then used a watercolor effect and a composite mode to merge them onto a painted background. The background is actually a treated image from the Hubble Space Telescope.