The world has always had a layer underneath it.
Not hidden. Not supernatural. Just more. A presence older than any name given to any place. The markers are part of that layer. They don't need us to function.
But something about being seen — being found — matters.
Limn does not show you new places.
It shows you that the places you already know are not fully known. You are standing somewhere you have probably stood before. A park you cut through. A corner you have passed a hundred times.
Nothing about the location has changed. But something about how you are seeing it has.
Find a marker. Look through it. That is enough.
Panes are scattered across the real world. Each one is a node. When you find one, something notices. You are not the first. You will not be the last. But you are the one standing here now.