Synthetic: fake - unreal. But then again, what is real?
Immanuel Kant answers all your questions of the nature of cognition and reality with more questions. "Critique of Pure Reason" is an iconoclastic approach to the way perceptions differ, even if it's a perception of the same event. His classification of Analytic and Synthetic judgments borders on skepticism by declaring the pointlessness of asserting fact from an experience. He forces the reader to examine his or her preconceptions of the very nature of reality simply by creating a distinction between the judgments we create as individuals.
If you like Monte Python and bizarre humor...