 What is special about light in this story?
For the flame that had sprung between them at the Truce of New Grass, she had challenged the feud of their peoples and had left her home, to follow him. They were great and evil as no other people has been, because they wanted the stars. "Because of them we must build with dreams instead of iron, and our only fire is that of the Sun, and even now, two thousand years later, the Earth is still slowly recovering from the pangs and poison of that age. From the center, over the citadel, an immense white globe soared upward, rising swiftly without sound.
 It can be manipulated by the people
 It is traded like a commodity  It is the only way the adventurers nowhere to go  It can be manipulated by the people  It is liquid-like in its composition