Artist Ai Weiwei has unveiled Mushrooms, a 40-metre installation of 500 cast-iron combat helmets, at Sydney's Museum of Contemporary ArtCultureSep 24 at 8:00 PM – Sep 24 at 9:03 PM3 outletsThe GuardianAi Weiwei unveils his epic new Australian work: ‘90% of art is just garbage. Real art questions the existing order’ Sep 24 at 8:00 PMThe Sydney Morning Herald500 combat helmets on Sydney Harbour: This global artist-activist’s call for peace Sep 24 at 8:40 PMPerthNowAi Weiwei says his piece on war and peace Sep 24 at 9:03 PM