[thom]

You could always compare how much your perceived reality matches predictions from your mental model. If you look at the concept of 'schemas' in child development, you'll see children focusing on one thing over and over again, like 'containment'. Putting a block in a box, taking it out, putting it in, taking it out. Each time they're learning that when you put something inside something else, it's still there even if you can't see it, that you can pick them up together etc etc. They're slowly exercising the different ways they can interact with their environment, learning to model likely outcomes. Learn enough of these schemas and you can start making more complex plans to see what the world does in response.