This is what appears to be a semi-hidden door next to the stage at the Queensland Performing Arts Centre (QPAC).
Now, if this were a Nancy Drew Game…
You would complete puzzles that would allow you to unlock the door to a secret tunnel below stage in which the runaway character of the game would be living/hiding out.
In this secret tunnel is the pictured door. In the door would be a panel you would slide open, through which you would observe a major development in the case involving under-the-table dealings of other characters.
What’s your “If this were a Nancy Drew Game” moment?