During the first half of the twentieth century, a significant shift to general aesthetic theory took place which attempted to apply aesthetic theory between various forms of art, including the literary arts and the visual arts, to each other. This resulted in the rise of the New Criticism school and debate concerning the intentional fallacy . At issue was the question of whether the aesthetic intentions of the artist in creating the work of art, whatever its specific form, should be associated with the criticism and evaluation of the final product of the work of art, or, if the work of art should be evaluated on its own merits independent of the intentions of the artist.
In 2014 Stewart and French video engineer Thomas Pachoud created Proximity Interactive – a live interactive video installation for art galleries. It was subsequently programmed in the 2016 Adelaide Biennial as well as taken into the permanent collection at the Australian Centre for Media and Image (ACMI). Stewart and the team devised another version of this technology as a rehabilitation tool for people suffering from strokes, aneurisms and other acquired neurological damage. It is being currently being trialed at the Hampstead Rehabilitation Centre in Adelaide by neuroscience researchers from the University of South Australia.