A stained glass window can compel you to think about the story it tells.  The Black Tarot is evocative in a similar way.

A tarot card can be viewed as a scene from a mythic story, playing out the dance of a pantheon.  Reading from a book of tarot reveals part of the ongoing saga. The wisdom in it comes from deriving the moral of the story.

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While not exhaustive, the traditional minor arcana are generally regarded to represent these categories:

Wands: fire, energy
Pentacles: earth, materiality
Swords: air, intellect
Cups: water, emotion 

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Likewise, the following relationships can be helpful when reflecting on the Black Tarot:
Spheres: fire, logic, energy, origin
They are the energy underling the universe, just a point and a radius, the simplest objects that can be defined.
Snakes: earth, ethics, materiality, nature
They are the natural material world, including the wisdom of life.
Keys: air, epistemology, intellect, tools
They are the methods and tools the life of our universe uses to shape it, and are manifestations of intellect.
Stars: water, metaphysics, emotion, congruity
They are the shimmering water of the night sky and the the spiritual congruity that links the universe.