The Plane Channel is actually a corridor connecting the gateways of two planes.
This corridor sounds like a very narrow place, but in reality, it is quite wide.
One must understand that the distance between planes far exceeds the diameter of a single universe, and even several universe diameters. As for the width, it is much larger than the diameter of a Star Domain. If the width of the Plane Channel is not sufficient, it can easily collapse.
Especially when dealing with planes of different levels: it's like a water pipeline connected to a large tank on one end and a small wooden barrel on the other. So under the same height of the pipe, water flows backward from the tank to the barrel because the pressure in the tank is greater.
Planes of different levels are the same. Due to different energy concentrations in the planes, in the Plane Channel, the direction is reverse flow from the Basic Plane to the High-level Plane.
