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 (15[1])uncertainty” of a story by this author in which a telescope salesman advertises “pretty (*) eyes, pretty eyes.” (10[1])Along with (10[1])Poe, this author is often cited (10[1])as the creator of the modern detective story for his novella Mademoiselle de Scuderi. Sigmund Freud’s essay “The Uncanny” examines (10[1])a story by this author in which Nathanael realizes that Olympia is an automaton created by Coppelius, whom he associates with the title mythical night visitor. For 10 points, name this German author of “The Sandman.” ■END■