> Indeed, but the two issues are independent. When I implemented tinySelf
> 1 on top of Self the two languages were almost identical and yet the
> implementation technique was of a completely independent layer (like the
> Lisp or Prolog on top of Squeak examples I gave).

Just for the record, if the Lisp you're refering to is LispKit 
(http://www.zogotounga.net/comp/squeak/lispkit.htm), then it is an 
extension of Squeak, not an extra layer.

Stef