As a quick post, here is a picture I took a few days ago of a Galveston Seawall staircase along the Gulf of Mexico.
There are a number of metaphors you can derive from this picture. I could offer some, but I have sufficient confidence in you to come up with you own.
Or you could just see the picture as what it is on face value--A staircase that when the tide is up leads into the Gulf of Mexico. I trust your impressions.
Metaphor is a big part of NeilAquino.com. and of how existence works. Please consider looking around the site to see what I am saying.