This is peripheral to the real focus of this thread, but it's worth noting 
the parallel between objects and closures.  You can implement encapsulation 
with closures--although it's less useful if without mutability.  Scheme was 
supposedly designed as a language for exploration of object-oriented 
systems.

user=> (defn two-accessors
         [n]
         (list
           (fn [] n)
           (fn [] (str n))))
#'user/two-accessors

user=> (def x (two-accessors 25.0001))
#'user/x

user=> ((first x))
25.0001

user=> ((second x))
"25.0001"

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