I just posted a link in the sidebar. It's a YouTube link to a video about how John Locke* expanded on the philosophical thoughts of Rene Descartes and then George Berkeley** (pronounced "Barkley," because he was Irish) made a mockery of Locke. The video's pretty funny, even if the guys speak in a hard-to-understand gibber.
*Yes, the same as the name of the character on Lost. There's probably a reason for that--like Locke's a "man of faith" in both contexts.
**The University of California, Berkeley was named in George's honor, though the pronunciation has slid over the years to become "Burkley" instead of "Barkley."