In dreams they often express man made or shaped. The can be columns that are natural but with man made designs, so are indicating powerful natural forces in you that have been shaped by the quality of your life.
They are sometimes a power source and suggest something you could access.
Example: Now I looked back at the column, and was very surprised to see, on the top strange designs, little fronds of green leaves. It was, I suddenly saw, a huge tree, and the leaves were sprouting at the top. To the right was another such tree, but smaller. The shape of these columns was like massive spacecraft cylinders pointed at the top.
Useful Questions and Hints:
What sort of cyclider are they and what do they suggest?
Are there any feelings in the dream, or suggestions of feelings?
Do they give the impression of being alive or hollow?