The light sphere will be a sphere I will add to the scene as the light source which is creating the shadows which you currently see in the scene. The skylight is already helping me with all the GI that I want. It isn't obvious from this image but the soft shadows are playing tricks along several of the edges. Environmental lighting can make that work much better depending on how long you're willing to wait. You can check on the shadow lab experiment in the back room for more information. Had to go and take photos for a dinner last night so I didn't get a chance to work on the tank. Tonight I will though! -Kix -Kix

-Kix