I left the x-axis out intentionally, as I can only relate the two points on the two graphs against each other. The y-axis is and can't be defined in this case.
And yes, it is some kind of doodle, the y-axis would be the amount of "knowledge" (hard/or believed) on the one, and the other should probably have two y-axes ...

In the end, a doodle can still help to visualize a point you want to make ;-)