[plt-scheme] Re: More pedagogic stuff

P.S. Yes, I have read Paul's book and I think Haskell has something  
to it.
You may be surprised to learn, however, that world.ss animations are
purely functional while Haskell animations (in Paul's book) are actually
quasi-imperative. That is, they are using monads and carry the  
imperativeness
on their sleeves.