Here is the picture classical foundationalism draws of empirical justification: Our system of beliefs is structured like a pyramid, it consists of a broad foundation of perceptual beliefs, i.e. beliefs reporting the contents of our perceptual states, and a superstructure of worldly beliefs, i.e. beliefs reporting what is going on in the world around us. The beliefs building the foundation, the perceptual beliefs, are to be justified noninferentially, by direct appeal to our perceptual experiences, while the beliefs in the superstructure, beliefs about what is going on in the world around us, are to be justified inferentially, i.e. by appeal to other beliefs. Ultimately, our worldly beliefs thus rest on our perceptual beliefs, which in turn draw upon our perceptual experiences
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