my DVD $matrix is Scalar; # or
my DVD @disks is Array; # or, even
my DVD %disks is Hash;

##</code><code>##

my DVD $matrix is Media; # or
my CD @disks is Media;

##</code><code>##

my DVD $matrix is Scalar;
$matrix = "I know Kung Fu";

##</code><code>##

my DVD $matrix is Media;
$matrix = "There is no spoon";