4. Which of the following arguments does Descartes use to show that our senses do not give us information we can be sure of?

A. We often dream about things that are completely beyond ordinary experience

B. If you stand nearer a windmill than I do, the two of us will see it differently.

   
C. You can work out mathematically that sometimes our sense experience must be wrong. D. People sometimes report seeing things when we know that they must be mistaken.    
       

(A) I take to be not quite right because Descartes thinks the laws of mathematics are not broken in dreams.

(B) looks suspiciously like Berkeley's argument about primary/secondary qualities.

(C) I don't know of this occurring in Descartes, though I think he gets near to it at times.

(D) seems the right answer. Descartes makes this point in discussing what is said by people categorised as insane.

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