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";

use Person loads the Person module
The module implements the Person class
Subroutines in Person are the methods for class Person
Person does not export anything
If $hamlet is a Person object, $hamlet->set_name will call Person::set_name
No need for exporting
No namespace collision problems