How I see the world as kind of an illusion is we see and perceive things as being solid, when they are not there made up of many frameworks of energy and are porous. First if you imagine you could see the electrical framework of everything, you would see its for the most part all energy. I actually believe that light is a frequency not a color. Our brain through our eyes picks up these frequencies, which tells our brain what its supposed to be seeing. Illusionary light and shadow tricks have shown clearly our brain decides what we are seeing and what that image should look like including shadows even if none are provided.
I am pretty sure diodes work by producing a frequency of a specific color of the spectrum. So the universe may be dark, its just that our brains can take frequencies and other data to construct what we see or should see. So is it even really there maybe even this is an illusion? I think its here not an illusion but in part a type of illusion.
Best regards Hope you are feeling better and stronger every day.