The "R" meme is the most powerful and widely-shared meme: that there is a "real world out there" independent of our minds. This is the intuitive insight that is denied or at least challenged by "Idealism" [1]. Denial of R turns out to be a powerful " intuition pump ". We imagining that the "real world" does not exist at all, and it's "all in our minds". This is a rather strong denial of Idealism, since an Idealist would, I think, admit that the real world exists -- just that we can't know anything about it other than what pops up in our minds. At the risk of spoiling the plot, the view of this blog is that the brain can be thought of as a fantastically complex and specially-constructed knot that intimately ties the mind M to the world R. This connection is so intimate that it is, in practice, impossible to say where mind ends and world begins [2]. In effect, this frames "Idealism" as a discussion about a dis...