Bookmatching

Bookmatched onyx at the Barcelona Pavilion
Bookmatched maple violin back. The visual match is imperfect, since the wood of a violin back is shaped with a chisel after being sawn out.
Spinet (a type of harpsichord) built in 1765 by Johann Heinrich Silbermann. Bachhaus, Eisenach, Germany. The panel to the right of the keyboard employs dramatic bookmatched veneering. Click for a clearer view.

Bookmatching is the practice of matching two (or more) wood or stone surfaces, so that two adjoining surfaces mirror each other, giving the impression of an open book.