TIAN (田): The field. The character is a pictogram, suggesting rice paddy fields.
GE (格): The style
BEN (本): The root, the booklet
TianGeBen: The exercise book with the little squares (looking like paddy fields) to write well-centered characters; the stage II in character learning; the door to open to go from recognition to cognition; the way my Chinese teacher welcomed me back to China.