Lisp indeed leaves you with your own ideas and your own limitations. It doesn't pose any artificial restrictions on your programs that you have to work against, and it doesn't provide any "color by numbers" examples that make you feel like you have achieved something. Lisp requires you to be creative. (http://steve-yegge.blogspot.com/2006/04/lisp-is-not-acceptable-lisp.html?showComment=1145470320000#c114547037402357120) (Pascal Costanza)