If you 'hear' a sound in your mind you are perceiving sound. An fMRI would show the same parts of the brain are active as if you were actually hearing a sound. But is there really a sound? No. Because there were no vibrations through the air or other medium. The vibrations through a medium are the sound.
As for pondering reality, these are macroscopic objects and do not need to be observed to exist or influence the environment unlike subatomic particles in quantum mechanics.
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A lesbian trapped in a man's body
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