blackboard, chalkboard texture on white background

message symbol chalk leer student drawing quadro board pizarron slate class white basen tacurren vla teacher concept insect education university copy space giz and learning used billboard wandtafel text communication close advertising nemicro eordm nnnnedeg chalkboard lesson lousa dziewczynki negro svart hintergrund write schiefertafel blackboard blank handwriting schoolboard ad schwarz background elements