Happy face ideal for teachers and parents: Reward the child who has done something right. Reward the child for overcoming new challenges or difficult situations. Identify the child who has been in charge of the day, the birthday boy, the child who has had a little brother… Ideal for children: Show that they have understood the lesson. Express your mood. Indicate that they have completed their daily tasks (snack, homework, brushing their teeth…) 20 mm in diameter.