I think the OP is right. All the input to a human brain can be expressed as numbers, at any given time a specific radiation, vibration, or chemical reaction is hitting our "sensors" and by the law of physics this is just numbers ( in terms of differentiation, brain does not know absolute values ).
Our output ( mechanical and vibrations ) is also fully quantifiable, thus numbers.
Our output ( mechanical and vibrations ) is also fully quantifiable, thus numbers.
One giant lookup table.