I'm sure it must have been done before, but couldn't find it...

#!/usr/bin/perl
sub imagine {
          &imagine(not exists $_{heaven});
          not $us{below}{hell};
          keys $us{above} == ($sky);
          for $p (@people) { &imagine($p) and
                     $living{$p}{localtime}; }

          &imagine(not @countries);
          not $hard_to_do;
          not(@kill or @die_for) and
          not @religions;

          for $p (@people) { &imagine($p) and
                     $peace{$living{$p}{life}}; }

          &imagine(not @posessions);
          $you_can = rand 1;
          not($need{greed} or $need{hunger});
          $man{brotherhood} = map {$_=>@man} @man;

          for $p (@people) { &imagine($p)
                     and $share{$p} = map {$_=>1} @world; }
          $dreamer{$self} and
          keys(%dreamer)>1;
          $dreamer{$you}
          and &live(@world) == &live($one);
}
[download]

Any comments will be appreciated :)
Grimborg.