Your agent may need a way to ask for a &quot;kind&quot; of training instance from the world in order to maximize meaning. Like maybe I&#x27;ve seen mammals, and now I need to see another kind of animal to maximize my understanding of the meaning animal. A human being—perhaps instinctively, or perhaps by some other force—has the curiosity to go find &#x2F; pay attention to fish and birds. A kid can tell you he wants to go to the zoo.<p>A supervised machine learning framework can&#x27;t tell the researcher what training instances it needs to see in order to improve its meaning. A supervised learning framework can&#x27;t imagine where it might find that training instance, or describe what it may look like. A supervised learning framework never asks to go to the zoo.