The idea of a thing or state does not entail the reality of that thing or state, and while the reality of a state or thing might be reflected in experience there is no necessary resemblance between the idea and that reality. Descartes is right however in noting the one necessary exception to this: that experience is, means that the experiencing is knowingly real. Whatever is known is relative to a frame, except for the knowing itself, which is its own frame. Again it is as if to say that all arrows go one way, except that for there to be any arrows at all there must be one that goes the opposite way. Again this works not as a truth but as the sole criterion of truth, the spring from which all our rivers flow. As such the exception outweighs any and all phenomena that conforms to the rule. The audacity of this is so great that we employ every means at our disposal to systematically nullify it. And why not? Look what a fabulous world we have constructed out of that denial!