Although I don't use Lisp in my daily programming, I do tinker with it when exploring new concepts. Basically I find that any abstraction can be quickly, not necessarily efficiently, implemented using Lisp. The absence of syntactic and even semantic constraints allows novel ideas to be tested which would be too awkward in more "conventional" languages.

As it has been said, many advanced systems contain an incomplete, faulty implementation of Lisp. So cutting to the chase, simply use your favourite Lisp system and hack away.

I can relate to that feeling.