Classroom blackboard - Chalkboard texture

blackboard chalkboard background chalk board school blank classroom white drawing class texture grunge advertising space black billboard grungy textured write lesson message symbol teaching student advertisement abstract macro nobody noticeboard photo photograph rubbed smudged surface wall copy old empty education communication close dirty frame green list exam studying teacher erase reminder used learning scratch childhood university knowledge information remember college note pattern learn copyspace teach and announcement bulletin closeup concept design element horizontal ad advert sign vertical handwriting notice pillar grungebackground designelement