In a scene in this novel, a character thinks about the varying altitudes of ginkgo leaves while his instructor watches him have sex with his instructor's wife. Another scene in this novel ends with a youth in a straw hat declaring, "I am Faustino Higueras. Defend yourself." The protagonist of this novel meets with professor Uzzi Tuzzi, and the Cimmerian language features prominently in this novel. The diary of Ermes Marana forms part of this novel, whose protagonist loves Ludmilla. This novel alternates between the first chapters of fiction novels and a second-person narrative. For 10 points, 
In a scene in this novel, a character thinks about the varying altitudes of ginkgo leaves while his instructor watches him have sex with his instructor's wife. Another scene in this novel ends with a youth in a straw hat declaring, "I am Faustino Higueras. Defend yourself." The protagonist of this novel meets with professor Uzzi Tuzzi, and the Cimmerian language features prominently in this novel. The diary of Ermes Marana forms part of this novel, whose protagonist loves Ludmilla. This novel alternates between the first chapters of fiction novels and a second-person narrative. For 10 points, identify this novel by Italo Calvino.
In a scene in this novel, a character thinks about the varying altitudes of ginkgo leaves while his instructor watches him have sex with his instructor's wife.
If on a winter's night a traveler [or Se Una Notte d'Inverno un Viaggiatore]