Object: A simple children's jigsaw puzzle with a picture of the completed puzzle on the front of the box.

Good morning, boys and girls! This morning I brought a puzzle with me. When we put all the pieces together, we will have a picture just like the one on the front of this box. (Hold up the cover.) Sometimes it is very hard to make all the pieces fit. It takes a long time to finish a puzzle, but when you are finished, it is a good feeling to know that you did it, and you also have a nice picture. Now I want you to pretend that you have put the whole puzzle together, and you find that one of the pieces is lost. You can't finish the puzzle becaus…