Twenty-seven pieces on what a mind is, and the format is the argument: after each one, Hofstadter and Dennett add a Reflection that pushes back on it. Borges dreams a man into existence; Lem’s tiny beings beg their maker not to switch off their world; Nagel asks what it is like to be a bat and concludes you cannot know. Every contributor is a man, which the Cool Tools write-up says plainly.