"This is a wonderful extension of an already lovely book. Dan Friedman and Matthias Felleisen are in love with recursive thinking, and with Lisp as a vehicle for explaining it.... The authors carry total novices from childish 'toys' all the way to extremely abstract concepts deep in the heart of logic and computation. And yet from beginning to end, it's done with humor and obvious, infectious joy ... by no means just another guide to programming tricks and tools ... it is a rich, spicy, deep dish. If it were a pizza I would love eating it!"
- Douglas Hofstadter, author of Gödel, Escher, Bach
"Many readers will be delighted and edified by Friedman and Felleisen's novel approach to the recursive programming language Lisp."
- Raymond Smullyan, author of To Mock a Mockingbird --This text refers to an out of print or unavailable edition of this title.