Typical OO Program

        use Person;

        $hamlet = Person->new();
        $hamlet->set_name('Hamlet');
        $hamlet->set_age(24);

        print $hamlet->get_name, "'s age is", $hamlet->get_age, "\n";

Person->new() is like Person::new('Person')
new does not need to be exported
Person->new tells Perl which new function to call
Person->new is expected to construct a Person object and return it
We will see the internals of Person::new later
Objects are scalars