Ключевые слова: abstract, advertisement, advertising, banner, black, blackboard, blank, board, chalk, chalkboard, class, classroom, clear, closeup, concept, copy space, dark, darkness, decoration, desk, dirt, dirty, empty, learning, lesson, list, message, nobody, note, object, old, school, scratch, space, student, surface, symbol, teaching, text, texture, textured, wall, white, write,