The beginning of the story: After a little while, he hailed a hansom and drove home. For a few moments he loitered upon the doorstep, looking round at the silent square, with its blank, close-shuttered windows and its staring blinds. The sky was pure opal now, and the roofs of the houses glistened like silver against it. From some chimney opposite a thin wreath of smoke was rising. It curled, a violet riband, through the nacre- coloured air. Question- How does Wilde create a tense atmosphere at the beginning?