Ключевые слова: above, abstract, backdrop, background, black, blackbackground, blackboard, blank, chalk, chalkboard, chalkboardbackground, class, closeup, color, copyspace, dark, design, dirty, drawing, dye, education, empty, erased, graphic, grunge, material, monochrome, nobody, note, old, pattern, rough, school, slate, space, spot, surface, template, text, textspace, texture, textured, wall, wallpaper, white, wooden,