Ключевые слова: abstract, agent, anonymous, background, behind, blackboard, business, businessman, businesspeople, caucasian, chalkboard, character, concept, creative, criminal, detective, european, eyeglasses, fashion, gangster, glasses, hands, headless, illustration, incognito, investigation, invisible, levitating, looking, male, man, mystery, people, person, private, searcher, secrecy, secret, security, shirt, silhouette, spectacles, spying, suit, surveillance, tie, unknown, unrecognizable, wall, white,