Ключевые слова: abstract, ad, advertisement, aged, ancient, backdrop, background, black, blackboard, blank, burned, chalkboard, class, classroom, college, concrete, crack, damaged, detail, dirty, distressed, erase, fragment, frame, gray, grunge, grungy, handwriting, learn, lecture, messy, old, paint, pattern, reminder, retro, rough, soot, stain, stone, surface, teach, teacher, texture, textured, university, urban, wall, weathered, white,