In one work, this thinker used the example of Castor and Pollux sleeping in alternating shifts to demonstrate that the soul is not always thinking. A chapter in a work by this thinker contrasts certain knowledge with arguments that are likely to be true based on “probability,” or agreement between our own and others’ experiences. This thinker described a central concept being affected by sensory experiences of intrinsic “primary qualities” and subjective “secondary qualities.” This thinker argued that reflection or sensation (10[1])informs all “objects of thinking” to refute “innate ideas” in favor of the human mind as a blank slate, or tabula rasa. (10[1])For 10 points, name this Enlightenment philosopher who wrote An Essay Concerning Human Understanding. ■END■