In a school joy is pretty important. Joy with discipline, of course.
Joy, happiness, excitement, entertainment, amusement, being glad, satisfied, etc., are necessary at school.
This is not against rigor in studying and learning and teaching. Rigor and smiling are compatible, no doubt.
Joy too tends to unite and join people.
Man and woman are social beings, right? And joy unites people, as I said. In a nice way: respect, listening to others, helping others, talking together, getting together, solidarity. / Photo from: IMG_4705 smiling kid pixshark com