To someone who is born blind, how would you best discribe what seeing is?

I assume that, over time, you've memorized where everything in your living space is. You have some idea of what shape the space around you takes.

Seeing is knowing what shape a space takes without trial and error. The depth of a room or the texture of a couch. Knowing where an item is without having to touch it, or be told where it is.

How it feels... it feels safe. Seeing makes me feel safer. That's the only word that comes to mind.