The Sun seems to be what brings all goodness and happiness in Valleyfold. When Atoi fell into the world, she made a hole in it. The Sun seems to be a portal between Tearaway's world and the real world. The You can be seen in the sun as well as scraps come from the sun. The only way to reach the sun is to get to the top of Gibbet Hill, and even that failed to work as Atoi bumped into Scraps and fell into Sogport's Crash Site.
"Source of life, light and warmth. When it doesn't have a dirty great hole in it."