Grand staff???????
When music on two staves is joined by a brace, or is intended to be played at once by a single performer (usually a keyboard instrument or the harp), a great stave (British English) or grand staff (American English) is created. Typically, the upper staff uses a treble clef and the lower staff has a bass clef<span>.</span>
I believe it would be the filter.
Michelangelo, is well-known for his marble sculpture pieta.
