Sometimes I wonder.Nickiepoo said:IT'S THE DUCK POND!
I remember reading or watching something behind-the-scenes and they seemed to really make it a point that they had to install a duck pond where one didn't exist because the script called for it. It seemed utterly unimportant in the episode except to give slight insight into how The Doctor thinks (what doesn't belong). Something that's always stayed with me is that you don't mention something in a script or play if it's not vital to the story (Chekhov's gun).