Theseus, insured

The harbour has two ships with the same name. One has sailed every season for thirty years and contains not one original board; the crew has never changed, the log is continuous, the registration number is painted on the bow. The other was assembled last spring from the discarded planks, in the original order, by a carpenter with the original drawings. It has never sailed. Both owners hold a policy in the ship's name. One of them sinks.