Perhaps, reality and physical world are just mind constructs or models {solipsism}|. Perhaps, people can only be sure that self exists. They cannot know if anyone else exists.
problems
However, people cannot then use "I" or "my", because they have no relation to outside world or other minds. Brain seemingly needs outside information to perceive and cannot create all perceptions using only its own resources. People rarely create coherent and consistent stimuli. People can have amusement and surprise, so they do not already have all knowledge inside. Universe seems to have been here before people existed [Fichte, 1794].
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6-Philosophy-Metaphysics-Theories-Mind
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Date Modified: 2022.0224