There are some differences between Racket and the Scheme in SICP, for instance SICP Scheme is a little bit more "vanilla", and uses set-car!, set-cdr! instead o

There are some differences between Racket and the Scheme in SICP, for instance SICP Scheme is a little bit more "vanilla", and uses set-car!, set-cdr! instead of the set-mcar!, set-mcdr! and other mutable pairs stuff in Racket (disclaimer: I don't know Racket, I just fumble with it occasionally while reading Scheme books that use other dialects). The best thing it adds though is full support for the picture language. http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-15.html#%_sec_2.2.4 http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-15.html... You can do things like > (right-split rogers 4) And get the resulting image right there in the DrRacket REPL.