Tortoise: But we must be careful in combining sentences. For instance you’d grant that “Politicians lie” is true, wouldn’t you? Achilles: Who could deny it? T

Tortoise: But we must be careful in combining sentences. For instance you’d grant that “Politicians lie” is true, wouldn’t you? Achilles: Who could deny it? Tortoise: Good. Likewise, “Cast-iron sinks” is a valid utterance, isn’t it? Achilles: Indubitably. Tortoise: Then, putting them together, we get “Politicians lie in cast iron sinks”. Now that’s not the case, is it? ---- Douglas Hofstadter, Gödel, Escher, Bach: An Eternal Golden Braid. Basic Books, 1979