No witnesses have come forward to say they noticed it being erected either.
From the summit of a hill in the centre of the park, the golden head gazes mournfully west towards the setting sun (or perhaps Northcote Plaza Shopping Centre).
The council was made aware of the work on Thursday afternoon, and is yet to take action.
“Council is as stumped as our community on this one,” Darebin Mayor Susan Rennie said. “We don’t know who this mystery golden figure is, where they came from, or what they want, but we’d dearly love to find out why this curious enigma has recently appeared at All Nations Park.”
Darebin City Council officers will assess whether the sculpture poses a safety threat to residents. They will discuss its fate in coming weeks.
Online commenters speculated the gilded head portrayed Tyler Cassidy, a 15-year-old boy killed by Victoria Police in 2008, the subject of a previous statue in the park.
Others guessed Egg Boy or the former host of ABC’s Recovery, Dylan Lewis.
The sculpture also has the esteemed approval of art critic Robert Nelson.
“It immediately made me think of the gold people who pretend to be statues in the city as a performance, which is simultaneously an imitation of sculpture and an endurance test,” Mr Nelson said.
“I also like the obelisk that seems to make an ironic gesture to the great tradition of vain brazen images, like the Ozymandias immortalised by the poet Shelley.”
Correction: An earlier version of this story mistakenly stated that Tyler Cassidy’s death was in 2015. It was in 2008.