My set had 2 main elements. There was a 3 sided rolling platform that was a hilltop on one side, Noah's ark on another and the stairway to heaven on the last. It was a 3 dimensional piece except for the ark. The other element was a large round disc that changed colors. The stage was very small, and the director wanted the disc to move around the stage. Of course I wanted it to be stationary in a corner so that I could back light it with an instrument and a scroller. Today I would do it with LEDs. I think the orchestra was 4 or 5 pieces and I put them in a booth stage left. It sounded great.