Read Bishop George Berkeley.
Briefly and thus somewhat inaccurately, He held everything is only ideas in some mind. Modern philosophers also recognize the "other minds" problem. I.e. I cannot be sure there is anyone else like me that has thoughts, feelings and a mind. (Behavior as if they did is possible and such beings are called "zombies.") Not only do zombies have no mind, they have no feelings or in the term more technically used "qualias." For example a zombie if burned by a cigarette will cry out struggle to get free etc. but feel nothing. They are biological machines programmed to behave AS IF they had feelings.
Personally, I think there does exist a material universe without any perceiver required (IN CONTRAST TO THE GOOD BISHOP) but this cannot be proved. I especially like Berkeley’s reason for the perceived world to follow natural laws -namely only if they exist can God work miracles as miracles are violations of the natural laws. In Berkeley's POV he was a lesser spirit creation of the mind of a greater spirit, God. Everything was God or the mind of God.
The material universe cannot be independent of consciousness or the mind otherwise it would be "unreal". Thus unreality is non-informational and thus non-observational. It is nothing. And it has no relationship or connection to the spacetime manifold in which the universe can be real. The unreal universe is non-relational to the real universe and cannot exist, so it does not exist. There can be no external reality to a conscious observer and observation. Communication is the means of building an objectifiable reality in which our conscious brain can explain.
Physical matter exists within the reality of the mind and the communication between individuals. The mind is not an object. It is the reality.
I APOLOGIZE FOR THE REMARKS!
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