[corrected version] 'Is it possible for a machine to think?' ... the trouble which is expressed in this question is not really that we don't yet know a machine which could do the job. The question is not analogous to that which someone might have asked a hundred years ago: 'Can a machine liquify gas?' The trouble is rather that the sentence, 'A machine thinks (perceives, wishes)' seems somehow nonsensical. It is as though we had asked 'Has the number 3 a colour?' (BB 47) But a machine surely cannot think! - Is that an empirical statement? No. We only say of a human being and what is like one that it thinks. We also say it of dolls and no doubt of spirits too. Look at the word 'to think' as a tool. (PI §360) SW
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