In Homo Irrealis André Aciman explores what the present tense means to artists who cannot grasp the here and now. Irrealis is not about the present, or the past, or the future, but about what might have been but never was, but could in theory still happen. From meditations on subway poetry and the temporal resonances of an empty Italian street, to considerations of the lives and work of Sigmund Freud, Constantine Cavafy, W. G. Sebald, John Sloan, Éric Rohmer, Marcel Proust, and Fernando Pessoa, and portraits of cities such as Alexandria and St. Petersburg, Homo Irrealis is a deep reflection of the imagination’s power to shape our memories under time’s seemingly intractable hold.