VOLCANO
Why ? Because we never really know what happen inside the Volcano (the haft lower part of the draw) it’s always unknown, it’s turbulences, it’s mysteries. The only thing we know about it, is the moment it explodes (=the half upper part of the draw), it’s beautiful, it’s power, it’s energy, it’s bomb.
You can also do an euphemism and consider it like man’s sexual function. We don’t see what happen inside the body, all the hormonal interactions, receptors, muscles, organs (=half lower part of the draw) The only thing we can see is the ejaculation. Because it’s the only thing that go out the body, this is power, energy, magic (=half upper part).
An other exemple can be the one of a random human, me, you, anyone who shows to the external world, his beauty, his power, his bravery = upper part. Knowing in the same time that inside himself, it’s the unknown, the hidden, the unreachable, the chaos, the empty = lower part..