Ariel's house was imperfect. He had built it himself, and -having only built the one- was far from all-knowing on the subject of construction. And so the house needed constant maintenance to keep from slowly collapsing.
Nonetheless, Ariel was quite proud of his achievement. There was a mirror on one wall, reflecting the entirety of the house's interior. And when he gazed into this mirror, he saw exactly how he fit in with his achievement. He was a part of the house, and that thought gave him comfort. So he spent much of his days staring into the mirror.
On the ceiling above that was a skylight built into the roof, built to keep the house bright. Looking upward did not give a sense of comfort. By day the sun would hurt his eyes, and by night the countless stars made Ariel feel small and insignificant. And whenever he raised his head to look through it, he also perceived cracks in the walls, severe enough to take the entire house down! So he would work tirelessly to fix the cracks before it was too late.
Once, an entire week went by in which Ariel peered only through the mirror, and never the skylight. It was a happy week. That is, until a piece of the house fell on Ariel's head! He survived the blow, and quickly set to work. It was almost too late, but he managed (with much difficulty) to preserve the house. It was then that Ariel realized his folly, and he smashed the mirror into a thousand pieces.
So caught up in the emotion of the moment was he, that he forgot to send the mirror outside before doing so. And so the floor was covered in shards. To this day it hurts Ariel to walk in his own house, but the house still stands.