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"When Joanna eats an orange, she gets a look on her face like when other people eat a lemon. She can't take more than one segment at a time. She says it tastes sour. I usually think the same orange is nice and sweet."
The excerpted passage from Sophie's World is an illustrations of Locke's belief of sensations such as color, smell, taste, and sound, that reproduce only the effect of the outer reality on our senses. Locke referred to such sensations as these.
What are secondary qualities?