Last week I came across a Usenet post from Kent Pitman (who helped create Common Lisp, and coined the terms Lisp1 and Lisp2 in this paper: https://www.dreamsong

Last week I came across a Usenet post from Kent Pitman (who helped create Common Lisp, and coined the terms Lisp1 and Lisp2 in this paper: https://www.dreamsongs.com/Separation.html https://www.dreamsongs.com/Separation.html) which provides the best explanation I have seen on why Lisp2 is a good idea: https://groups.google.com/forum/#!msg/comp.lang.lisp/6TkfPLeWpk0/rAxTREHhlw0J https://groups.google.com/forum/#!msg/comp.lang.lisp/6TkfPLe... Also as pointed out by KMP later in that thread, block and go tags are separate namespaces, and so are type names. I like to say that it is really Lisp1 vs LispN. Any language with macros and first-class identifiers is going to be capable of having arbitrarily many namespaces.