The Big Ball & Chain was originally nestled in the sand at the beach for the 2015 Sculpture by the Sea exhibit in Cottesloe. These days it sits near the train station in a park. The creator, Norton Flavel (who also created the Big Hand in Armidale, NSW) wanted to pay homage to the first convicts who arrived by sea in shackles.

I thought it looked just a bit more at home behind the fence like the convicts . you are looking at about 3 time normal human size.