It is far more complex than your brain seeing what it expects to see.
The eye is only focused in a very small section of the view your brain bulids and also there is the 'blind spot' where the optic nerve enters the rear of the eye. Your brain just 'paints in' the bits that are not clear and/or fills them in from previous scans of that section of the view, This is why people 'see' waht is not there and do not 'see'' stuff that is there but has not been scanned ver recently.
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