Undiscovered ring-while-held plate shapes with multiple resting zones remain to be found

Evidence

There are certainly many shapes with the same property that lie undiscovered. An interesting challenge would be to invent a shape with two different holding tabs, each quiescent at a different frequency; an even bigger challenge would be to make these frequencies somehow musically related. — Eric J. Heller, Why You Hear What You Hear- An…, 1407

Categorization

• SEED: The challenge of designing a plate with two quiescent tabs at musically related frequencies is a great hands-on acoustic design problem worth profiling.