Ключевые слова: advertisement, backdrop, black, blackboard, blank, blue, board, brick, brick wall, capital letter, chalkboard, circle, classroom, communication, composite image, computer graphic, connection, copy space, cube shape, digital, digital composite, digitally generated, digitally generated image, display screen, education, effect, empty, flare, flash, global business, globe, glow, graphic, gray, indoors, landline phone, large group of objects, learning, leisure games, lens flare, light, light natural phenomenon, lighting equipment, mobile phone, outdoors, phone, planet, school, science, shape, shine, single word, sphere, studio shot, subject, sustainable resources, technology, text, texture, textured, triangle shape, wall, western script, white, white background, wood, world map,