Ancient Skepticism and Our Perception of the World

The early modern philosophers of the seventeenth and eighteenth centuries were concerned about whether sense perception gives us the information on the objects we experience.  But the roots of this problem go back to the ancient period.  We will look at passages from Sextus Empiricus, a late ancient skeptic who collected together arguments of the ancient western philosophers to cast doubt on our ability to see the world as it is.  Time permitting, we will consider the problems such arguments raised for the scientists and philosophers of the early modern period.