Looking Professorial
When a teacher doesn’t come to class and a substitute is sent to take her place for the day, students usually run wild and free. They feel like there’s no authoritative figure there to set order.
Source: pinterest
This teacher knew very well that if she wouldn’t show up, no work would be completed that day. So she had the substitute project a slide with her picture on it looking serious and professional, to set the correct tone despite her absence.