They are not ghost stories. They are Spiritist stories.
Casey shares two literary gems set in Madrid and inspired by this 19th-century synthesis of Science and Religion: one from Amalia Domingo Soler's Cuentos Espiritistas, and the other a non-existent looping tale of progress, sarsparilla, and the complications of subversive communication with the Spirit World:
"But neither Jotim nor Wallace is certain if spirits have names, if they are earthly names or spirit names, if it is blasphemous to evoke them, or if their names change, or for that matter if after bodily death the opinions and ideas of the spirits change once they return to a state of Spirithood, and so they fall to discussing whether or not animals have spirits, why Spirits must act secretly, why some children can communicate directly with spirits, and why do babies cry when they are born, and is rebellion part of the natural law, and finally if any man can detain the march of human progress, and here they desist, for both of them agree that the march of human progress is impossible to detain."