The Argument from Illusion begins with the premise that our senses can be deceived. This is supported by the fact that we often experience illusions, such as mirages or optical illusions. If our senses can be deceived, then we can never be sure that what we perceive is actually real.

The Argument from Illusion concludes that we can never know anything about the external world. This is because our senses can be deceived, and we can therefore never be sure that what we perceive is actually real. This means that we can never know anything about the external world, because all of our knowledge about it is based on our senses.

The Argument from Illusion is most closely associated with the French philosopher René Descartes. Descartes was a skeptic who doubted the existence of the external world. He argued that the only thing we can be sure of is our own existence, because we can think. This is known as the Cogito ergo sum argument.

There are a number of objections to the Argument from Illusion. One objection is that the fact that we can be deceived by our senses does not mean that the external world does not exist. Another objection is that we can use our reason to determine what is real and what is not. Finally, some philosophers argue that the Argument from Illusion is based on a false dichotomy, because it assumes that the only two options are that the external world either exists or does not exist.

The Argument from Illusion is related to a number of other philosophical problems, including the problem of induction, the problem of other minds, and the problem of free will. The problem of induction is the problem of how we can justify our belief that the future will be like the past. The problem of other minds is the problem of how we can know that other people have minds like our own. The problem of free will is the problem of how we can reconcile the idea of free will with the idea of determinism.