Ключевые слова: address, apartment, backdrop, backgrounds, blue, blue mailboxes, building, business, city life, communication, concept, conceptual, copy space, copyspace, correspondence, delivery, design, door, entrance, even, house, inbox, indoors, information, inside, interior, key, letter, letterbox, locker, mail, mailbox, message, modern, number, post, postage, postal, postbox, residential, row, rows, security, send, service, steel, urban, wall, wallpaper,