The Sky Is Blue

With his dog, a boy is out in a meadow flying his kite. What happens is that the kite starts to fly the boy instead as they are whisked upward into the clear blue sky. The boy and the kite encounter things in the sky that he could see from the ground, but the higher and higher they go, the more otherworldly are the things he encounters. But if he goes up, is there a way he will make his way back down?