Answer:
Step-by-step explanation:
What i think this means is that Ernest is learning about a world that doesn't exist.
How i got this was-
Lessons basically means learn, so we know Ernest is learning about something.
If a world doesn't see him, then it probably doesn't exist.
So it means that Ernest is learning about a world that doesn't exist.
Hope i helped you sorry for the long-winded explanation so have a great day! :)