Watch this instructional ceramics video to learn how to trim a large tiered bowl with Simon Leach. With a thin bowl, one needs to be careful when balancing the upside-down bowl on the bat. Leach trims each individual tier with a large trimming tool. The large and possibly wobbly ceramic bowl can become once again even and graceful with some adventurous trimming. As we can see from the trimming process, when throwing a tiered bowl, it helps to leave some extra bulk.