I've noticed in recent years that my favorite (three) languages share some things in common: * None of them are "mainstream" or "standard" (which, for those who know history, basically means: not *Algol* based) * All of them work within their own "image" or environment. * The idea of a "stand-alone executable" is a anethema and an alien concept. * All of them encourage "rapid prototyping" * All of them encourage programming "from the bottom up" * All of them strongly encourage "small" programming units. * And: all three of them incorporate totally different programming models :-) What three are they? LISP (of course)..... and FORTH, and Smalltalk. I didn't put all these factors together until about a year ago. So: what are *your* favorite concepts in LISP (and other languages)? I might add I'm a real fan of OOP, so I'm bound to learn CLOS sooner or later.... -- David Douthitt HP-UX, Solaris, Unixware, Linux, FreeBSD RHCE, SCSA, Linux+, LPIC-1 http://www.lulu.com/ssrat