 CONT: When Carolyns poetry teacher writes his name on the board the  first day of class (prior to instructing the students to turn their  desks in a large circle facing one another) as he puts the chalk  down on the ledge a horizontal line is formed near his name that is  clearly visible. When the camera switches frames to the class and  then back to the teacher the line has apparently been erased and is  very hard to see where it was once prominent.