A type of sculpture in which images or forms project out from a flat surface. The depth of imagery in a relief is evaluated as shallow or high‚ the latter indicating imagery that projects out from the surface far enough to be nearly three-dimensional. Two of the most famous historical reliefs are Lorenzo Ghiberti's baptistry doors in Florence (1425-1452) and the frieze reliefs among the so-called “Elgin Marbles,” from the Parthenon in Athens, housed at the British Museum (447-432 B.C.).