teacher pointing to "happy teacher's day" message on a chalkboard with colorful doodles

teacher classroom student 039 day chalkboard happy school education woman knowledge smiling doodles learning professor chalk writing back training teaching educator educational young desk board tools mentor study children lesson academic blackboard lecture celebrate celebration explanation students world kids college background child book class learn teach pedagogy illustration illustrated pointing teacher#39aph39#s message colorful stands written large letters surrounded hearts celebrating special occasion playful way