Yamawaki-sama
This is Kawaguchi Hidetoshi. This is my humble answer to the question.
As you said, exactly everything is expressed in Buddhism as something like a dream, something like an illusion.
For example, in Ryuju Daishi's fundamental theory, it is explained that “Kan Sanshoshin” (7, 35) “as if it were an illusion, like a dream, like a mirage (Gandharva Castle), life is like that, living is like that, and destruction is like that.” , “Kansho Shouten” (23, 8), “The various shapes, sounds, tastes, things you can touch, scents, and “things” are just that (there are no unique entities), and they look like mirages (Gandharva Castle), and are similar to sunshine and dreams.”
Other expressions include water bubbles, water mirrors, rings of fire, plantains, and thunder.
All of these are expressions used to explain the “sky” of “no entity.”
Of course, even if we say that there is no substance, it is not emptiness or emptiness that there is nothing.
Although there is a way of being, it itself appears as a manifestation of that thing, and although it itself is actually formed as an independent self existence, this is not the case, and it is made up of “luck,” that is, it is made up of being dependent on others, and simply, it is made up of causation (cause and condition).
As a result of good causation, good results will occur, and in particular, you want to achieve good results by firmly practicing the causal relationships to lead to enlightenment and nirvana as explained in Buddhism.
Kawaguchi Hidetoshi Gassho