This is "Take Your Daughter to Work Day", and Mr dicastro has invited his seven year old daughter Naomi to observe him teaching his high school geometry class. This may be a bad idea because niomi:
a. will see her father through the students' eyes,
b. may be exposed to rude teenagers,
c. is not old enough to have acquired formal operational thinking, which is necessary to understand geometry and other forms of abstract mathematics,
d. has not yet reached the stage of post conventional reasoning