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You have never seen the sun set at this height. Come, look.’ The puller went to the edge and sat down, his legs hanging over the side. He saw that they hesitated. ‘Come. You can lie down and peer over the edge, if you like.’ Hillalum did not wish to seem like a fearful child, but he could not bring himself to sit at a cliff face that stretched for thousands of cubits below his feet. He lay down on his belly, with only his head at the edge. Nanni joined him. ‘When the sun is about to set, look down the side of the tower.’ Hillalum glanced downward, and then quickly looked to the horizon. ‘What is different about the way the sun sets here?’ ‘Consider, when the sun sinks behind the peaks of the mountains to the west, it grows dark down on the plain of Shinar. Yet here, we are higher than the mountaintops, so we can still see the sun. The sun must descend further for us to see night.’ Hillalum’s jaw dropped as he understood. ‘The shadows of the mountains mark the beginning of night. Night falls on the earth before it does here.’ Kudda nodded. ‘You can watch night travel up the tower, from the ground up to the sky. It moves quickly, but you should be able to see it.’ He watched the red globe of the sun for a minute, and then looked down and pointed. ‘Now!’ Hillalum and Nanni looked down. At the base of the immense pillar, tiny Babylon was in shadow. Then the darkness climbed the tower, like a canopy unfurling upward. It moved slowly enough that Hillalum felt he could count the moments passing, but then it grew faster as it approached, until it raced past them faster than he could blink, and they were in twilight. Hillalum rolled over and looked up, in time to see darkness rapidly ascend the rest of the tower. Gradually, the sky grew dimmer as the sun sank beneath the edge of the world, far away. ‘Quite a sight, is it not?’ said Kudda. Hillalum said nothing. For the first time, he knew night for what it was: the shadow of the earth itself, cast against the sky.
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