Homeowners with basements won't recognize this annomaly. I had never seen one until we moved to this home. This Stonehenge configuration is all that lies between our home and a *mama-to-be* skunk, once she chooses ours crawlspace as her future family's safe haven. Therefore, Stonehenge must never be allowed to fall, or to be left open after workmen emerge from the depths of the crawlspace. Mama-to-be skunks are nothing if not tenacious. If they can't budge the door after the first entire night of relentless trying, they return to scratch, scratch, scratch all night, every night until they succeed in gaining entry.
Don't ask me how I know that.