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Exactly. What we do is, if we need that extra push over the cliff, you know
what we do?

    my $amp = Amplifier->new( max_volume => 11 );

Eleven. Exactly. One louder.

So far, so good. But what if we wanted to make this the default? Sure, we
could make ten louder and make that be the top number, or we could remember to
specify the C<max_volume> parameter each time we use it. But let's assume
we're working with temperamental artistes who will be too busy worrying about
the quality of the backstage catering to think about checking their volume
settings before they go on stage.

Thankfully we didn't hard-code the maximum volume but used the C<$MAX_VOLUME>
package variable instead. We can change it directly like this:

    $Amplifier::MAX_VOLUME = 11;

Or using the class L<var()> method (just to show you what the roundabout way
looks like):