Reduction and dimensions

Hello Rabbi,
I finished the series of lessons on reduction and I have a few questions:
1. I didn’t understand how the suggestion of dimensions solves the issue. How can one even understand and talk about higher dimensions?
2. Doesn’t this simply reduce(!) the question to whether it was reduced in our dimensions? That is, in our 3 dimensions there is still a problem compared to the other dimensions that we don’t have, and therefore there is no conflict between the existences. (Wow, I think I really didn’t understand how dimensions work…)
3. How do light and illumination fit into the whole picture?
4. What does raising sparks mean in this image? Discovering deeper dimensions? How can we reach dimensions that are not within us in the first place?
I would be happy if you could explain it to me, sorry for the misunderstanding.