Furnace listened intensely to her explanation. 
While he studied her words he thought of the way he could get a hold of energy from deep inside and send it outwards.
He saw a mental image of how he'd move his hands to manipulate the strands and strings that flow trough the ether.
The image shifted to Alula plucking strings from the sky, weaving sharp beams of moonlight with grace and ease.
Then his imagination shifted to an opposite. Carver making the same movements under the sun, weaving bright lances of sunlight with strength and vigilance. Both receiving their power, flowing down from the heavens in a shower of inspiring patterns.

These were energies of a nature strange to Furnace.
Like the positive and negative they were two sides of a coin, but that was were the similarities stopped.
"I understand. Complex forces don't come as natural to me as the more simple energies like light and dark. Or heat."
Furnace looked defeated, yet still curious. He carefully touched his forehead.
"What words are there here?"