This cauldron was 4' in diameter at it's widest, and it needed to break on stage. To achieve the shape, I cut concentric rings out of foam board and stacked them on top of one another using a strong wood glue. I mounted the piece to a lathe, and smoothed down the ridges to the correct contour. The foam was then covered with strips of muslin and painted to look like jade. The broken piece was held in place by magnets until the singer would knock it over at the end of the show.