Well, I wanted to preserve the symmetry a little bit. As you can see, all of the pillars have counterparts (except the collapsed one on the right, though you can see the globe in the grass and remains of the pillar on the ground). There are moonglobes to the left and sun-globes to the right. I used the same texture (a picture of our real world moon) on all of them and had a little story in mind.



The castle and all the details pay respect to Luna or Celestia but they also lived together in the castle. I imagined the yellow orbs glowing stronger during daytime to illuminate the corridor in friendly light with the light reaching to the other pillars overlaying the subtle crescent shape and drowing out the moon-like surface of their own with the glow. This way...during the day.... the whole corridor would be more "daylike".



In the night however, the yellow orbs would not glow, allowing the crescents to appear on the left pillars. These would eminate their pale cooler light into the whole corridor. Without the glow of the yellow orbs. The moon-like surface of these orbs would now be visible with the pale light hitting it from one side, giving the whole corridor a more "night like" feel.