SYDNEY - The Sydney Opera House, world heritage-listed as "one of the indisputable masterpieces of human creativity", celebrated its 40th birthday Sunday with a flotilla of lifesavers, Aboriginal dancers and a gigantic cupcake.
Huge crowds packed the steps for a distinctively Australian performance on the glittering harbourfront, where three generations of Danish architect Jorn Utzon's family were the guests of honour.
It was a postcard-perfect day beneath the same cloudless blue skies that inspired Utzon's winning design to build Sydney an opera house back in 1956 - the white sails drawn from his childhood in the Aalborg shipyards.
"A building like this happens once in a lifetime," Utzon's son Jan told revellers on Sunday.
"It is a unique Australian expression of will and enthusiasm and 'let's go do it' kind of spirit."
A crew of surf lifesavers wearing their famous yellow-and-red caps and costumes arrived at the Opera House's Man O' War steps on one of Sydney's distinctive ferries, flanked by six of the association's dinghies and two tugboats.
They were met and led up the red-carpeted steps by Aboriginal dancers where a traditional smoking ceremony was held to spiritually cleanse the site accompanied by an indigenous dance ritual and didgeridoo.
A giant cupcake topped with a model of the Opera House made from icing was carried onto the stage by the lifesavers, and Australian rocker Jimmy Barnes - frontman of Cold Chisel - led a rousing chorus of Happy Birthday accompanied by a navy brass band and school choir.
An Etihad A340 made a low pass over the site to cap celebrations.