perlref - Perl references and nested data structures
+=head1 NOTE
+
+This is complete documentation about all aspects of references.
+For a shorter, tutorial introduction to just the essential features,
+see L<perlreftut>.
+
=head1 DESCRIPTION
Before release 5 of Perl it was difficult to represent complex data
such as in a signal handler or a Tk callback.
Using a closure as a function template allows us to generate many functions
-that act similarly. Suppopose you wanted functions named after the colors
+that act similarly. Suppose you wanted functions named after the colors
that generated HTML font changes for the various colors:
print "Be ", red("careful"), "with that ", green("light");