Peter van Inwagen's answer to the Special Composition Question is that composition occurs when and only when:
AObjects are in direct spatial contact with each other
BThe composing objects form a living organism
CThere is a convention or social practice of treating them as a unit
DThe objects are made of the same kind of material
Van Inwagen famously argued that composition only occurs when parts constitute a living organism — this is his 'organicist' answer. On this view, tables and chairs do not exist as composite objects (only the particles arranged table-wise do), but persons and animals do. His criterion preserves the entities we most care about while denying the existence of ordinary artifacts. The other options represent alternative positions philosophers have explored but are not van Inwagen's view.
Question 2 Multiple Choice
A philosopher claims there is a genuine composite object consisting of her left shoe, a particular cloud over Brazil, and the number seven. What metaphysical position does this claim reflect?
AMereological nihilism — since even ordinary objects are denied, this extreme case follows
BRestricted composition — some arbitrary collections do compose objects
CUnrestricted mereological composition — any collection of objects composes a further object
DVan Inwagen's organicism — these parts are in causal contact through the world
Unrestricted mereological composition holds that for any collection of objects, however scattered or arbitrary, there exists a composite object they compose. This is associated with David Lewis and has a certain logical elegance (no need to draw arbitrary lines about when composition occurs), but strikes most people as wildly counterintuitive. Nihilism goes the opposite direction, denying composite objects altogether. Restricted views allow some but not all composition.
Question 3 True / False
Mereological nihilism holds that while composite objects don't exist, ordinary objects like tables and chairs still exist as useful organizing concepts with genuine ontological status.
TTrue
FFalse
Answer: False
Nihilism holds that composition never occurs — there are no composite objects whatsoever, only fundamental simples (particles with no parts). On this view, tables and chairs do not exist as genuine objects; there are only particles 'arranged table-wise.' The table is a useful fiction or a convenient way of speaking, not a real entity in the fundamental inventory of the world. This is revisionary about ordinary objects, not accommodating of them.
Question 4 True / False
On the view of unrestricted mereological composition, for any two distinct objects, there exists a third object that they jointly compose.
TTrue
FFalse
Answer: True
Unrestricted composition says composition always occurs — for any collection of objects whatsoever, there is a composite object they compose. This applies to any pair, any triple, any arbitrary set of things. The resulting ontology is very 'liberal': there are vastly many composite objects, most of which we have no names for and never think about. Lewis accepted this because he preferred not to have to answer the question 'when does composition occur?' — if it always does, there is no question to answer.
Question 5 Short Answer
Why is the Special Composition Question considered a genuinely metaphysical question rather than merely a verbal dispute about how we use words like 'object' or 'thing'?
Think about your answer, then reveal below.
Model answer: The SCQ has implications for what fundamentally exists — the most basic inventory of reality. The answer determines whether persons and organisms exist as composite objects (with implications for ethics and philosophy of mind), what ontological commitments our best physical theories carry, and whether there is a fact of the matter about composition independent of human linguistic conventions. A merely verbal dispute could be settled by stipulating definitions; the SCQ resists this because competing answers have genuinely different downstream consequences for what we should say about minds, moral status, and the nature of matter.
The philosophical force of van Inwagen's formulation is that he shows the question cannot be dismissed as semantic without consequence. If nihilism is true, persons are composites that don't exist — which seems to threaten personal identity and moral status. If unrestricted composition is true, there are infinitely many objects cluttering the universe that common sense ignores. These aren't just terminological differences; they are different claims about what the world contains.