Category: identity
Type: puzzle
Associated thinker(s): Allan Gibbard
Original publication or approximate period: Gibbard, “Contingent Identity” (Journal of Philosophical Logic, 1975), using the names Lumpl and Goliath
Difficulty: Intermediate
Themes: constitution, coincidence, modal properties
Related experiments: Ship of Theseus; Dion and Theon; The Problem of the Many (Tibbles the Cat)
A sculptor makes a clay statue of the infant Goliath in two pieces, one above the waist and one below. When she joins the two halves, a new piece of clay comes into existence at the same time as a statue. Gibbard names the statue Goliath and the piece of clay Lumpl. A day later, the sculptor smashes the statue, ending both. During their shared existence, they have the same matter, shape, location, and history.
Now consider a different possibility: before the clay dries, the sculptor squeezes it into a ball. By the persistence criteria Gibbard stipulates, the statue would cease to exist, while the piece of clay would survive in a different shape. Gibbard argues that this gives a case in which Lumpl and Goliath are identical in the actual story but would have been nonidentical, though both existed, in that counterfactual. Whether his account of identity and possibility succeeds is disputed.
Can two things occupy the same place and consist of the same matter at the same time, or must the statue and the clay be one and the same thing?
If Lumpl and Goliath are strictly identical, they cannot literally differ in their properties. Gibbard argues that they are identical in the actual story while a counterfactual change could have separated their fates. Other philosophers reject contingent identity and may instead treat them as distinct, coinciding objects. The case therefore tests how we understand identity, modal claims, and the persistence conditions associated with kinds of objects; it does not by itself settle which account is right.
If the statue and clay are distinct, a further question is what explains their difference when they share their matter and history. If they are one object, an account is needed of why the statue and clay seem to have different persistence conditions. These are live metaphysical questions, not settled consequences of the example.
Constitution views commonly hold that the statue and lump are distinct objects occupying the same place, with the lump constituting the statue; they must explain how such coinciding objects differ and what grounds the difference. Identity views identify constitution with identity, but must address the apparent differences in kind and persistence. Revisionary or eliminativist views reject one or more ordinary statue-and-lump objects, or revise how we describe what exists. Gibbard’s contingent-identity proposal says that the statue and lump can be identical in the actual case yet not necessarily identical; this depends on his account of names, persistence, and modal predication. These are broad families of responses, not an exhaustive or mutually agreed taxonomy, and the debate remains open.
The puzzle does not require the sculptor to perform a mysterious action, and it is not a problem about artworks alone. Comparisons with a person and a body, or a ship and its timber, can help introduce related questions, but they are teaching analogies rather than claims that those cases have exactly the same structure. The puzzle is not settled just by noting that two names are used: the issue is what the names refer to and how identity and possibility should be understood.
Gibbard’s example uses invented names to focus on identity and modal claims. Cases involving a person and a body raise related questions, though they are not simply the same example. Ship-of-Theseus cases also concern persistence and identity, but typically focus on replacement or rearrangement of parts over time.
Gibbard’s original article was consulted for the scenario and argument (especially pp. 188–192); his persistence criteria are presented as part of his proposal, not as an uncontested account of ordinary usage. Publication details were checked against the publisher’s record. Ryan Wasserman’s Stanford Encyclopedia of Philosophy entry on material constitution and Harold Noonan and Ben Curtis’s entry on identity were read at the relevant sections for the competing responses and the status of the contingent-identity debate. Wolfgang Schwarz’s “Contingent Identity” was consulted in its full-text repository copy, especially §§2–4; it surveys arguments on both sides rather than establishing a consensus. This article is an educational explanation, not a resolution of the metaphysical dispute. Comparisons with person/body and ship/timber cases are teaching analogies, not additional claims attributed to Gibbard.
Research check: 2026-11-01. The sources above were checked at relevant passages; the full Gibbard article and scholarly entries were not read cover to cover. This source check is not expert review.