I have enjoyed programming in Common Lisp for decades. Learning and programming in Lisp can help a person to develop a greater appreciation of different problem solving strategies.
“Lisp has jokingly been called “the most intelligent way to misuse a computer.” I think that description is a great compliment because it transmits the full flavor of liberation: it has assisted a number of our most gifted fellow humans in thinking previously impossible thoughts.”
Edsger Dijkstra, The Humble Programmer, 1972
I greatly enjoyed this article on how development can flow when you’re in a truly interactive programming environment.