Some people have played with this idea http://readable.sourceforge.net/ http://readable.sourceforge.net/ http://www.informatimago.com/develop/lisp/com/informati

Some people have played with this idea http://readable.sourceforge.net/ http://readable.sourceforge.net/ http://www.informatimago.com/develop/lisp/com/informatimago/small-cl-pgms/m-expression/ http://www.informatimago.com/develop/lisp/com/informatimago/... In fact (if you didn't know) lisp M-expressions using whitespace and indentation existed long before python (though the original M-expression syntax idea was based on FORTRAN). The reason M-expressions aren't used in place of S-expressions is because people using lisp preferred and continue to prefer S-expressions.