Atop most temple bells in Korea is a mythical character called Poroe. Poroe is a dragon and is insanely terrified of whales. It is said that if he runs into a whale he will cry out in loud terrifying shriek. So the fish shaped striker is used to amplify and deepen the sensations of the bell.
The sound of the bell reminds us to stay ever present, liberating us. This tea container only acts to amplify our experience with tea and reminds us to always be present when preparing tea.