I have to admit, this one can be a tough esoteric nut to crack, but when you boil it down to essence, the idea represented here is simple. This is some kind of barrier or gate that you must pass through on your way back into the light.

You’ve seen this gate before of course, only this time you’re closer to the gates, and the sun is a little higher in the sky, suggesting that you are nearer your goal then before.