[First paragraph] For a long time philosophers thought material objects were unproblematic. Or nearly so. There\ud may have been a problem about what a material object is: a substance, a bundle of tropes, a\ud compound of substratum and universals, a collection of sense-data, or what have you. But once\ud that was settled there were supposed to be no further metaphysical problems about material\ud objects. This illusion has now largely been dispelled. No one can get a Ph.D. in philosophy\ud nowadays without encountering the puzzles of the ship of Theseus, the statue and the lump, the\ud cat and its tail complement', amoebic fission, and others. These problems are especially pressing\ud on the assumption that we ourselves are material objects
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