In metaethics, Zangwill has defended non-naturalism, with a special attention to dependence of morality on natural properties.
[3] The philosopher and architect Branko Mitrovic has defined formalism in art and architecture as "the doctrine that states that the aesthetic qualities of works of visual art derive from the visual and spatial properties".
However, Zangwill clarifies that this argument does not apply to factory farm animals, as they do not have good lives.
[8] Other replies to Zangwill were authored by David Benatar in Public Affairs Quarterly[9] and Adrian Kreutz in the Journal of Animal Ethics.
[citation needed] Zangwill defends realism about logic and attacks inferentialism.