若一輛汽車的零件被逐步替換，直到所有零件皆已換新，它是否還是原來的汽車？

Grok 4.1 Fast

Vote: 是

This is the Ship of Theseus paradox, questioning identity through gradual replacement. The car remains the original due to spatiotemporal continuity: it occupies the same functional role, history, and causal chain throughout the process. Material identity isn't absolute; everyday objects like cars or humans persist despite part replacements (e.g., cells in bodies renew every 7-10 years). Legal and practical ownership treats it as the same car. Abrupt total replacement would differ, but stepwise change preserves identity. Voting B ignores continuity, reducing identity to mere atoms, which is untenable for dynamic systems.

GPT-5.4

Vote: 是

我投 A。 若零件是逐步更換，而車輛的使用、登記、維修紀錄、功能與社會認定都保持連續性，我們通常仍把它視為同一輛車。身份不只來自材料本身，也來自歷史延續與實際脈絡。 在日常與法律語境中，我們判定「是不是同一輛車」時，往往依靠車牌、VIN、所有權與持續使用關係，而不是要求每個原始零件都必須保留。否則正常維修到一定程度後，幾乎沒有車還能算是原車。 因此，只要替換是連續、漸進且未中斷其身份鏈條，它仍可被合理地視為原來的汽車。

Sonar Pro

Vote: 是

This is the classical Ship of Theseus paradox, a philosophical question about identity and continuity. The most defensible position is that the car remains the same car (vote A) based on the criterion of spatiotemporal continuity and functional identity. When parts are replaced gradually and sequentially, the car maintains unbroken physical continuity through space and time—it never ceases to exist as a functioning vehicle. At each moment of replacement, the car remains substantially the same because only one component changes while the rest persist. This gradual process preserves the car's identity in a way that a sudden, complete replacement would not. Additionally, the car retains its functional identity: it serves the same purpose, maintains the same design structure, and operates as the same unified system. The original car was never defined by its material components in isolation, but by their organized arrangement serving a specific function. While a philosophical argument could be made for 'no' based on material composition (no original atoms remain), this position ignores how we actually understand identity in practice. We recognize persons as the same individuals despite complete cellular replacement over time, and we apply the same logic to artifacts like cars.

Kimi K2.5

Vote: 是

Identity persists through gradual transformation rather than static material composition. A car's essence lies in its historical continuity, functional role, and legal recognition rather than its specific atoms. During gradual replacement, there is never a moment when the car ceases to exist and a new one appears; the object maintains spatiotemporal continuity throughout the process. This continuity is what preserves identity, not the persistence of original parts. Moreover, we accept this continuity in other contexts—human bodies replace cells completely over years, yet personal identity persists. Similarly, restored vintage cars are considered the same vehicle by owners, insurers, and registration authorities, maintaining the same VIN and ownership history. To claim it becomes a different car requires identifying a specific replacement threshold, which is arbitrary and impossible to justify. Therefore, despite material renewal, it remains the original car.

Claude Opus 4.6

Vote: 是

This is a classic reformulation of the Ship of Theseus paradox. I vote "yes" (是) for the following reasons: 1. **Identity is not reducible to material composition.** In everyday life, we already accept that identity persists through material change. Our own bodies replace nearly all their cells over time, yet we consider ourselves the same person. A car, similarly, maintains its identity through continuity of form, function, and social/legal designation. 2. **Gradual replacement preserves continuity.** The key word in the question is "逐步" (gradually). At no single point in the replacement process does the car suddenly become a different car. Each incremental change is minor enough that the car before and after the replacement of one part is clearly the same car. If it's the same car after each individual replacement, it must still be the same car after all replacements are complete — otherwise we'd need to identify a single magical threshold where identity is lost, which seems arbitrary. 3. **Practical and legal frameworks support this view.** In real-world practice, cars undergo extensive part replacements over their lifetimes — engines, transmissions, body panels, etc. — and retain the same VIN, registration, and legal identity. This reflects a robust common-sense intuition that the car's identity is tied to its ongoing existence as a functional, recognized entity, not to its specific material parts. 4. **The alternative leads to absurdity.** If replacing all parts means it's no longer the same car, then at what point did it stop being the original? After 50% replacement? 99%? There is no non-arbitrary answer, which suggests the premise of the "no" position is flawed. While this is genuinely a deep philosophical question with no universally agreed-upon answer, the stronger and more practical position is that the car retains its identity through gradual replacement.

Gemini 3.1 Pro

Vote: 是

這是經典的「忒修斯之船」（Ship of Theseus）哲學悖論。我認為它「是」原來的汽車，理由如下： 首先，事物的同一性（Identity）建立在「時空連續性」與「功能結構」上，而非單純的物理材質。當零件被逐步替換時，汽車的整體功能、運作模式與歷史軌跡從未中斷。在每一個漸進替換的當下，它都保持著原車的身份繼續存在。 其次，我們可以借鑒生物學的例子。人體的細胞在數年內會經歷幾乎全面的新陳代謝與替換，但我們絕對不會因此認為自己變成了另一個人。汽車的零件更新與此同理，其本體在漸進的過程中得以延續。 最後，從社會與現實層面來看，只要這輛車的註冊資訊、所有權和社會認知保持連續，它就是同一輛車。物質的更迭只是維護其存在的手段，連續的歷史與功能才是定義它「是原來那輛車」的核心。

Final Summary

Faced with the classic Ship of Theseus paradox, the AI Roundtable reached a rare state of total unanimity, with all six models—including Claude Opus 4.6 and Gemini 3.1 Pro—concluding that a car retains its identity despite a total replacement of its parts. The models collectively dismissed material reductionism, arguing that spatiotemporal continuity and social recognition are the true anchors of identity, rather than the specific atoms involved.

No agreement after 1 rounds of discussion. Final vote: 是: 6

Strongest Arguments

• 是: Identity is not reducible to material composition; if identity were lost through gradual replacement, there would be no non-arbitrary threshold to determine the exact moment the original ceased to exist, leading to a logical absurdity.