Ключевые слова: abstract, art, artistic, background, black, blackboard, blank, board, chalkboard, classic, classroom, clean, concept, creative, dark, decorative, design, detail, dusty, education, educational, empty, erased, framework, graphic, grey, interesting, learning, marks, pattern, patterns, rough, roughness, school, slate, smudges, study, surface, teaching, texture, unique, vintage, wall, white, worn, writing,