The Lisp style has been really trying my sense of aesthetic. Yesterday I got really hung up on the fact that I prefer the 'message-passing' approach to OO rather than the 'call a function and pass in the object as an arg' style. The latter just feels clumsy to me.

Then it occurred to me that lisp syntax could easily support a message passing style. E.g. I could do:

(philaccnt 'withdraw: 10)
(meaning "send the 'withdraw' message to the philaccnt object with an argument of 10).

Hmmm... just write a 'class' macro that creates a hash of lambdas and function 'make-object' that takes the class hash and returns a closure that dispatches the messages to method calls.

Could be something to this lisp build your own language malarky...