There is only one empty set in existence, and all references to the empty set refer to the same thing. All physical reactions to the empty set are reactions to the same thing. This gives the empty set characteristics of a physical object.
We need to expand the scope and scale of consciousness so that we’re better able to understand the nature of the universe and understand the meaning of life.Elon Musk on the Lex Fridman Podcast (28 December 2021)