A stage with a pig driving a stake so they can add a fence, simple as can be!!, originally uploaded by Campobello Island.
I haven't seen one of these in action in years. I used to play on them when I was a kid, when they are not in use they pull them up on the beach. The hammer driving the large pole(stake) into the ocean floor is called a pig because it is made of pig iron and the floating platform is called a stage they are building a fence for a Herring Weir (Pronounced wear).