A movie narration goes:
The gold crescent moon hangs from a metal brace. Behind it is a lit church steeple. Stained glass windows are faintly lit. Carved statues march up the side of a building. (source)
I have never heard "march up" used to describe sculptures adorning a building. The phrase seems to make some but not a whole lot of sense as I assume the sculptures are immobile and thus can't exactly "march". I can see them line up the side of a building. What does "march up" mean here exactly?