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my $one = 1;
my $two = 2;
...
  $x += 0.1;
}
print "\$one = $one\n"; # still 1.5, no link between $arr[0] and $one

my $one = 1;
my $two = 2;
...
print "\$one = $one\n"; # changed to 11. $_[0] was an alias to $one.
indirect($one, $two, $three);
print "\$one = $one\n"; # still 11. The $a was assigned a copy of the 
+value. It's not an alias