artefactphil on the ontological difference.
Not Husserl, but Aristotle was the first to explicitly see the categories as ways in which the being of beings shows itself phenomenally and is accordingly addressed, but Plato also makes the breakthrough to categorial looking-at by the psyche in Theaitaetos [Θεαίτητος]. Perceiving the bell AS big and brown and ringing requires also the category of 'and'. The eyes cannot see the categories of 'something' or 'and' or 'bigger than' or 'sameness' or 'difference' and so on, but only the _psychae_, which always already (a priori) understands these categories of the being of beings. This is psychic or, if you prefer, mental vision, of which a robot is not and never will be capable.