I was just discussing this over at FreeRatio.org. I made the claim, which seemed intuitively true to me, that knowledge (JTB+) is a kind of belief. This caused some controversy. I made this simple illustration clarify how I intuitively grasped the idea.
A flaw was discovered in the above. It implies (wrongly) that there are no true or justified things which one does not belief in. This is false. Here is an extended diagram: