Glad you decided to post this one, it was always one of my favorites thematically amongst the ones we ever discussed.
I always imagined it as a spirit-like creature 'trapped' in a construct made of mirrors to maximize and focus its effect. I still think its an awesome concept, and with the recent correction the card reflects that well, and goes very nicely compared to Butterfly Effect for example (Focus is just not right anyway you look at it). Also as a creature, it fits a nice hollow spot in Light's arsenal, and goes perfectly with Blessing. I'm so sad I never made sketches for it..
Nice to know you sometimes still wander back to Elements :p