The roof has a copper-faced dome[1] which, as originally proposed, was supposed to be 13 feet (4.0 m) tall.[2] When it was ultimately installed in 1988, the dome contained eight steel ribs, each measuring 20 feet (6.1 m) long and weighing 700 pounds (320 kg). Each rib consisted of three sections.[20] The dome itself contains louvers and was designed with a green surface.[21] When the dome was constructed, wind created a loud whistling sound when passing through the louvers; this was remedied in 1992 with the removal of alternating panels.[22][6][24] Paul Sachner of Architectural Record initially likened the dome to that of the Nebraska State Capitol,[8] while Paul Goldberger of The New York Times said the dome was meant to relate to City Center.[25]