As I see it…

What we accept as being true during our lives forms the basis of our
perceived reality.

All the inputs of our senses are actually processed within our brain.
They are a “functional” representation of what’s actually out there. Your
brain projects this image to be external even though it’s all happening
within your mind. Since it’s a product of the human mind, one can think
of it as an artificially derived sense of reality.