What hides between Shadow and Light?

[Argoon]

Hello guys new user here.

About this riddle when you first start the Penumbra BP game in that room that you need to escape you find a paper with this words.

"Between light and shadow, exists an entire world. That world is necessarily our own.

Get out. Now.

O."

I tried to put that on the writing box, it didn't worked, but it must be a clue.