It depends on how you look at it. Each one by itself has the same value, that's not like in other decks, where the ace is more than the king and such. You only have that in the minor arcana in Tarot. The trump cards are sort of equal, none is higher than the other.

But the numbers form a sort of sequence. If you look at them as a journey through a human life, one follows the other and you can't have "The Devil" before "The Chariot" for instance. Although in some decks "Justice" and "Force" are reversed.

So its more about about one following another... like pointing your camera first and then press the button instead of doing it the other way round...