First Workshop 

Metaphysical Questions

21–22 February 2020

The Metaphysics of Property Perception

Friday February 21st

Goodhart Room

University College

University of Oxford

High Street

Oxford, OX1 4BH

13.30–15.00 Umrao Sethi (Brandeis University)

‘Sensible Individuation’


15.00–15.15 Break

15.15–16.45 Bill Brewer (King’s College London)

‘Property Perception and the Metaphysics of Properties’

16.45–17.00 Break

17.00–18.30 Louise Richardson (York University)

‘Olfactory Properties’

Saturday February 22nd

Ryle Room

Faculty of Philosophy

University of Oxford

Woodstock Road

Oxford, OX2 6GG

10.00–11.30 Keith Allen (York University)

‘Objects, Properties or Scenes?’

11.30–11.45 Break

11.45–13.15 Ivan Ivanov (Shandong University)

‘Perceiving Truth-Makers’

Commentators at large: Giulia Martina, Alex Moran

Objects are particulars because they can only be present in one place at a time. By contrast, properties are usually classified as universals: one and the same property can be possessed by objects in distinct locations at the same time. Yet property instances (or ‘tropes’) are particular: they are distinguished in part by which object or location possesses them; e.g. instead of a shade of red that might be shared amongst various objects, we isolate a particular chair’s redness.


Given this distinction between universals and property instances, philosophers ask: which of these do we perceive? Some insist we perceive only property instances (e.g. Schellenberg 2010), and others only universals (e.g. Johnston 2004); a few allow that we perceive both (e.g. Almang 2016). Yet each answer seems to sit badly with other claims we are tempted to make about perception.

If we perceive only property instances, we seem hard-pressed to explain what is in common between perceiving objects of the same colour. If we perceive only universals, it becomes more difficult to accommodate the manifest particularity of perceptual experience. On the other hand, if we say we perceive both, we would need a story about the relation between the perception of items of both sorts.

A quite different metaphysical question arises when we ask whether, and in what sense, sensible properties might depend on the mind. We are tempted to say that when we perceive a chair’s shape, for instance, the chair’s having that shape does not depend upon its being perceived; i.e. the chair would have had the same shape even if we had never seen it.

Many are also tempted to say that someone who hallucinates a seemingly identical chair succeeds in perceiving the same shape as the person who perceives the actual chair. Yet if the same property (in this case a shape) can be perceived in the absence of an object, this property’s presence seems to depend wholly upon our perceiving it. Does that mean that the property is mind-dependent?

Resolving this long-standing puzzle may require revising our metaphysics of sensible properties, or a revision of how we understand the role of property perception in hallucination.


All are welcome. Participation is free. There is no registration, but if you intend to participate, it would be helpful if you could let us know by emailing us at Please contact us if you require assistance of any kind.

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