Ключевые слова: advertisement, back, backgrounds, black, blackboard, blank, chalk, chalkboard, classroom, communication, concepts, copy, damaged, design, dirty, distressed, drawing, dust, education, empty, frame, front, grained, handwriting, ideas, imitation, industry, inspiration, learning, letter, message, messy, no, old, pattern, people, rough, school, schoolhouse, scratched, space, square, stained, textured, view, wall, wallpaper, white, writing,