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  1. or download this
    my $this = { 'name' => 'alex' };
my $that = \%{ $this };
...
$that->{'name'} = 'madonna';
print $this->{'name'}; 
# oh no! i'm madonna! they both referenced the same thing
  2. or download this
    my $this = { 'name' => 'alex' };
my %that = %{ $this };
...
$that->{'name'} = 'madonna';
print $this->{'name'}; #alex
# phew! I'm still me!