What does the phrase in the title mean?
We were working together, we were exploring the concept of a dream within a dream. I kept pushing things. I wanted to go deeper and deeper, I wanted to go… further. I just didn’t understand the concept that hours could turn into years down there. That we could get trapped so deep that when we wound up on the shore of our own subconscious we lost sight of what was real. We created, we built the world for ourselves. We did that for years. We built our own world.
I presume "wound up" means completely the same as "ended up" would mean. But what's that got to do with shores?