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The phrase "are walls" is correct and usable in written English.
It can be used in contexts where you are describing or defining walls, such as in a discussion about architecture, construction, or metaphorical uses.
Example: "In this room, the walls are painted blue, creating a calming atmosphere."
Alternatives: "constitute walls" or "represent walls".
Dictionary
Exact(60)
Mostly, these are walls of bravado.
There are walls, fences, rooftops, cemeteries.
There are walls, but no booths, no nooks, no shadows.
All that's missing are walls to permanently hang it on.
He can see that Andy's eyes are walls of water.
We don't readily see them, but there are walls between us.
"You think differently when there are walls around you," Mr. ag Leche mused.
It is definitely possible, but there are walls standing in the way.
The floor plan is open and there are walls of glass throughout.
When McGary sets screens now, Alexander said, "those aren't screens — those are walls".
There are walls of local rock on either side of the kitchen.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com