Abstract

In this chapter, the author presents some Cartesian thought experiments by reproducing an excerpt from The Meditations on First Philosophy. The author asks us to imagine that the physical world around us is an elaborate illusion. He imagines that the world was merely a dream or, worse yet, a hoax orchestrated by an evil demon bent on deceiving us. The author asks us to suppose that we are dreaming, and that some particulars ‐ namely, the opening of the eyes, the motion of the head, the forth‐putting of the hands ‐ are merely illusions; and even that we really possess neither an entire body nor hands such as we see. Nevertheless, he says that, it must be admitted at least that the objects which appear to us in sleep are, as it were, painted representations which could not have been formed unless in the likeness of realities.