<P> It is not universally agreed what the intended effect of these "optical refinements" was; they may serve as a sort of "reverse optical illusion". As the Greeks may have been aware, two parallel lines appear to bow, or curve outward, when intersected by converging lines . In this case, the ceiling and floor of the temple may seem to bow in the presence of the surrounding angles of the building . Striving for perfection, the designers may have added these curves, compensating for the illusion by creating their own curves, thus negating this effect and allowing the temple to be seen as they intended . It is also suggested that it was to enliven what might have appeared an inert mass in the case of a building without curves, but the comparison ought to be, according to Smithsonian historian Evan Hadingham, with the Parthenon's more obviously curved predecessors than with a notional rectilinear temple . </P> <P> Some studies of the Acropolis, including the Parthenon, conclude that many of its proportions approximate the golden ratio . The Parthenon's façade as well as elements of its façade and elsewhere can be circumscribed by golden rectangles . This view that the golden ratio was employed in the design has been disputed in more recent studies . </P> <P> The cella of the Parthenon housed the chryselephantine statue of Athena Parthenos sculpted by Phidias and dedicated in 439 or 438 BC . The appearance of this is known from other images . The decorative stonework was originally highly coloured . The temple was dedicated to Athena at that time, though construction continued until almost the beginning of the Peloponnesian War in 432 . By the year 438, the sculptural decoration of the Doric metopes on the frieze above the exterior colonnade, and of the Ionic frieze around the upper portion of the walls of the cella, had been completed . In the opisthodomus (the back room of the cella) were stored the monetary contributions of the Delian League, of which Athens was the leading member . </P> <P> Only a very small number of the sculptures remain in situ; most of the surviving sculptures are today (controversially) in the British Museum in London as the Elgin Marbles, and the Athens Acropolis Museum, but a few pieces are also in the Louvre, and museums in Rome, Vienna and Palermo . </P>

Name the sculptor who was in charge of creating the sculptures for the parthenon