Vronsky (another character in Tolstoy’s Anna Karenina) falls deeply in love with Anna, who is the wife of another man. For several months, they carry on a passionate affair. When Anna, however, fi nally leaves her husband to be with him, Vronsky fi nds that he soon becomes bored with their relationship. The fact that his feelings for Anna were much stronger when their relationship was more precarious is in keeping with the principle of __________________ contrast.