Lisp also has first and rest. Scheme isn't based on immutability. R7RS: > Literal constants, the strings returned by symbol->string, and possibly the environ

Lisp also has first and rest. Scheme isn't based on immutability. R7RS: > Literal constants, the strings returned by symbol->string, and possibly the environment returned by scheme-report-environment are immutable ob jects. All objects created by the other procedures listed in this report are mutable. > {}, [], ... These characters are reserved for the user in CL and have been used for a bunch of different things.