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Rh Rh changes over time may produce a new form, i.e., a newly designed structure—in which case it may be the new design that is relevant. See Kathriner v. Unisea, Inc., 975 F. 2d 657, 660 (CA9 1992) (floating processing plant was no longer a vessel where a “large opening [had been] cut into her hull”).

Nor is satisfaction of the criterion always a necessary condition, see Part IV, infra. It is conceivable that an owner might actually use a floating structure not designed to any practical degree for transportation as, say, a ferry boat, regularly transporting goods and persons over water. Nonetheless, we believe the criterion we have used, taken together with our example of its application here, should offer guidance in a significant number of borderline cases where “capacity” to transport over water is in doubt. Moreover, borderline cases will always exist; they require a method for resolution; we believe the method we have used is workable; and, unlike, say, an “anything that floats” test, it is consistent with statutory text, purpose, and precedent. Nor do we believe that the dissent’s approach would prove any more workable. For example, the dissent suggests a relevant distinction between an owner’s “clothes and personal effects” and “large appliances (like an oven or a refrigerator).” Post, at 8 (opinion of, J.). But a transportation function need not turn on the size of the items in question, and we believe the line between items being transported from place to place (e.g., cargo) and items that are mere appurtenances is the one more likely to be relevant. Cf. Benedict, American Admiralty §222, at 121 (“A ship is usually described as consisting of the ship, her tackle, apparel, and furniture . . .”).

Finally, the dissent and the Solicitor General (as amicus for Lozman) argue that a remand is warranted for further factfinding. See post, at 10–12; Brief for United States as Amicus Curiae 29–31. But neither the City nor Lozman