I've been going to the swimming pool for several years. In the morning there are only a few people. Also, schools have swimming lessons at this time. There is something primal about swimming, especially if old people are swimming on the track next to kids.
Kids feel free in the pool. It's fascinating how they differ in dynamics and expression. Some are bursting with energy while others are practically immobile all the time. Each one seems to be from a different dimension.
These observations inspired me to create this universe. Kids with supernatural powers, damaged kids, kids from royal families, kids - automatons and kids you'd better not mess with meet to swim in mana under the supervision of specialist staff, learn to control their powers, and have fun.