This author incorporated friends like Theodor von Hippel and David Koreff into a Decameron-esque collection that outlines his elusive Serapion principle. The protagonist of a story by this author receives a jewelry box containing the couplet “a lover who is afraid of thieves / is not worthy of love.” Ernst Jentsch analyzed the “intellectual uncertainty” of a story by this author in which a telescope salesman advertises “pretty (*) eyes, pretty eyes.” (-5[1])Along (10[1])with Poe, this author is often cited as the creator of the modern detective story for his novella Mademoiselle de Scuderi. Sigmund Freud’s essay “The Uncanny” examines a story by this (-5[1])author in which Nathanael realizes (10[1])that Olympia is an automaton created by Coppelius, whom he associates with the title mythical night visitor. For 10 points, name this German (10[1])author of “The Sandman.” ■END■ (10[3])