A number of pieces sit atop the headland that juts out between Bondi and Tamarama beaches (atop which sits Marks Park), including this work by R. M. (Ron) Gomboc. It's one of a series of sculptures in his Growing Together series. In this case it's grown the attention of one photographer, even though the light at this time was quite gloomy.
Addendum: My personal opinion is that Facebook is a sociopathic organisation that steals other peoples' intellectual property (including the images in this gallery) despite being explicitly denied permission to do so.