You are definitely thinking outside the box, lol! That reminded me of those hanging grow bags that were all the rage a few years ago for growing tomatoes. You were supposed to plant the tomato with the bag upright and then flip it over so the tomato would grow straight down. I guess it had a drawstring or something keep the soil from falling out. I guess the advantage was that it saved space and the tomatoes loved it. It seemed like a scam and a waste of time to me. However, this got me to thinking: could you grow a bonsai cascade like this and then flip it over and put it in a cascade pot for an upcoming show or just for part of the growing season? Would this solve the problem of dieback at the end of the cascade branches? Would the tree know which way is up? Maybe it supposedly worked with tomatoes because they are vines but most bonsai are not, except for jasmine, wisteria, etc.? This was just a random thought process. I am not running out looking for grow bags any time soon, but, knowing how creative and inquisitive members of the Bnut community are, maybe someone will try it and report back that I am full of shit, or that they have discovered a wonderful new method for making cascade style bonsai!