Every era has its dark, unattractive side. The Enlightenment ended in the bloody dictatorship of the Jacobins and the rampaging guillotine. Erotomania turned into virtue, and famous erotomaniacs—such as Casanova—enjoyed pan-European fame. It became unfashionable to have children, and they were sent to orphan asylums, where they were allowed to die peacefully. Jean-Jacques Rousseau sent all his legitimate children to an orphanage, but at the same time he wrote the novel “Emile,” which raises important questions about free, harmonious upbringing in the Age of Reason. The shadow of an era follows close behind the Enlightenment. And about this shadow, it isn’t customary to speak openly.