The sound bowls are made in a freeform way, without any intentional efforts to produce a certain sound. “The beauty of the ones I make is that they have a split tone in them,” says Wolkowicz. “They’re in between notes, and depending on where you hit the metal, the sound slightly differs from another place you might strike them at.” (The bowls are still available, along with some of Cave Collective’s jewelry, by custom order.)