The building's northern, eastern, and western exterior facade is made up of pink-granite walls, or glass-windows.[29] The southern exterior facade features an elongated glass wall, supported by concrete pylons grouped in fours.[29] The profile of the southern facade was designed to mimic a cathedral, with the concrete pylons being used in a similar manner to the flying buttresses found on Gothic cathedrals.[29] The eastern portion of the building's southern facade transitions into a low-leveled crystalline glass-cupola, which holds the museum's main entrance; and its western portion, which features a three-tiered glass-cupola.[29]