Ключевые слова: abstract, artwork, black, brain, brainteaser, center, challenge, circle, circular, complex, concept, design, difficult, discovery, exit, flat, game, graphic, hard, hopelessness, icon, image, infinity, labyrinth, line, maze, mystery, outline, pattern, problem, puzzle, riddle, round, search, shape, simple, simplicity, solution, solving, strategy, stroke, success, symbol, top, view, way,