and the Tortoise are trying to remember the name of an amateur mathematician, Achilles (incorrectly) suggests "Kupfergödel" and "Silberescher", then Mr Tortoise recalls Goldbach". Half-translated from German, these names are "copper Gödel", "silver Escher" and "gold Bach", respectively. Gebstadter's second book is an anthology co-edited with the Australian philosopher Denial E. Dunnitt entitled The Brain's U: Phantoms and Mirror-Images of Selfless Souls, and appears in the bibliography of The Mind's I: Fantasies and Reflections on Self and Soul, edited by Hofstadter and Daniel Dennett. The Gebstadter bibliography on the website for Stepford Ninniversity's "Residential Pictures in Mundanities and Artifice" gives the subtitle as Fairy Tales and Rotations on Ego and Anima. Gebstadter's third book appears in the bibliography to Hofstadter's third book, Metamagical Themas: Questing for the Essence of Mind and Pattern. This is a collection of Hofstadter's monthly columns from Scientific American with postscripts written specially for the book. Gebstadter, Egbert B. Thetamagical Memas: Seeking the Whence of Letter and Spirit. Perth: Acidic Books, 1985. A curious pot-pourri, bloated and muddled -- yet remarkably similar to the present work. This is a collection of Gebstadter's monthly rows in Literary Australian together with a few other articles, all with prescripts. Gebstadter is well known for his love of twisty analogies, such as this one (unfortunately not found in his book): "Egbert B. Gebstadter is the Egbert B. Gebstadter of indirect self-reference." Gebstadter's fourth book, presumably in Italian, is entitled Ambifoni: un minimondo ottimo per lo studio della scopertività, published by Hopeless Mobster, Tokyo, in 1987. This book is referenced by Hofstadter in his Italian book Ambigrammi: un microcosmo ideale per lo studio della creatività, published by Hopeful Monster, Florence in the same year. Hofstadter's book contains a fictional dialogue between Hofstadter and Gebstadter. Curiously, there is no mention of Gebstadter's fifth book in Hofstadter's Fluid Concepts and Creative Analogies: Computer Models of the Fundamental Mechanisms of Thought. However, rumor has it that it is entitled Stagnant Notions and Derivative Metaphors: Anthropomorphic Models of the Mechanical Fundaments of Computation, a collection of articles on the research of Gebstadter and his colleagues at the University of Mishuggan's Stagnant Metaphors User Group. Reviewers have supposedly described it as "an eclectic jumble, distended and unfocused," and it has been suggested by some that Hofstadter's Fluid Analogies Research Group was reluctant to give recognition to the work of a rival lab which they sometimes referred