The Museum's exhibition culminates in the third-floor gallery, which has been specially designed to accommodate the sculptures of the Parthenon. The space is arranged in the form of a glass-walled chamber that wraps around a rectangular core whose orientation and dimensions match those of the Parthenon's original cella. The outer walls of the core incorporate the relief-carved blocks of the temple’s Ionic frieze, mounted in the same position as they held on the monument, but at a lower height for better viewing. The metopes are presented in pairs between the steel columns of the hall, which have the same number as the Parthenon’s columns, while the colossal figures once displayed in the building’s two pediments have been mounted on low, pedestals at the east and west side of the gallery, where they are visible from all directions. The exhibition combines the original marble sculptures with plaster copies of those retained in the British Museum or other foreign museums. The glass walls enclosing the gallery provide natural lighting and allow a direct line of sight between the sculptures and the monument from which they come (theacropolismuseum).