Ah! No breaking bubble! I searched for it and couldn't get it (there is no complete doc about all pre built function in arc, out there, heh? You just gotta read the source on and on till you get them all, I guess (wich is, in definite, not a bad thing at all!)).
I actually wanted to re-write it using a hash but couldn't get right away the semantics and syntax they had. This is perfect, It'll get me to discover how they actually work.
Thanks for the tip! It'll render better :)
Though, for the sake of learning (I am, for sure, studying PG's version and learning from it), could anyone quickly comment my code cause and what bad practices I'm doing (I may be a newbie in Lisp, but I still feel when things aren't elegant!).