 There are cases that pose similar diachronic identity puzzles that do not involve change of parts. One of the best known involves a lump of clay which, at an earlier time, is coincident with a statue, but, at a later, say as a result of deformation, is just a shapeless lump of clay. Other much discussed cases of putatively distinct things at one time being coincident at another involve fission or fusion. One of the most famous examples of a fission case is provided by the ship of Theseus. Over a long period all of the planks composing a certain ship are replaced one by one. Eventually a ship indiscernible from the original, but composed of entirely different planks, results. Call that later ship Replacement. As each plank is removed from the original ship it is used to construct a ship that is constituted from all and only the planks belonging to the original ship. Call the ship composed of the same planks as the ones initially composing the original ship Reassembly.