Ключевые слова: abstract, advertisement, backgrounds, billboard, black, black and white, blackboard, blank, board, bulletin board, chalk, chalkboard, classroom, close up, copy space, dark, design, design element, detail, dirty, drawing, education, empty, flat, frame, front, full frame, gray, grunge, horizontal, idea, indoors, inside, learn, message, nobody, old, rectangle, retro, school, side view, smudged, study, surface, texture, textured, university, wall,