Lush as a language was developed in 1987, just like it says on the website. Older versions of it are reading the numbers off of your checks when you deposit it in the ATM machine. The ideas it embodies are significantly older than common lisp: it is a very pure hackers lisp: sorta has the eau de zetalisp about it (not that I really know anything about zetalisp, I ain't that old, but I've read about it). Studying it will make your brain grow. http://lush.sourceforge.net/credits.html