Ключевые слова: background, black, blackboard, blank, board, chalk, chalk board, chalkboard, class, classroom, copyspace, dark, dirty, distressed, dust, education, empty, frame, gray, grunge, grunge background, grungy, learn, learning, noticeboard, old, rough, school, school board, slate, smudged, space, teach, teaching, texture, textured, white, wood,