来自《耶鲁大学开放课程：心理学导论 第7集》

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  How do you tell a lump of coal from a snowball?
  你如何才能区分出煤球和雪球呢
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  Well, that's a lump of coal
  那是一个煤球
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  and that's a snowball,
  而那是一个雪球
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  and it's from Google images.
  这是谷歌上搜到的图片
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  How do you know which is which?
  你是如何区分的
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  Well, a lump of coal you say is black
  好了 你说煤是黑色的
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  and a snowball is white.
  而雪球是白色的
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  How do you know?
  你怎么知道
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  Well, maybe you have on your retina--
  或许它映在了你的视网膜上
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  Your retina responds to
  你的视网膜对于
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  sort of color that hits it.
  刺激它的颜色有所反应
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  It's oversimplified,
  这么说太简化了