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by Tronno 1689 days ago
> Roman plasterwork was applied in layers, and in first layer (which is quite rough) a diamond pattern is scratched.

I don't think that's correct. I'm pretty sure the pictures actually depict opus reticulatum, which is a style of brick-lined cement work.

https://en.m.wikipedia.org/wiki/Opus_reticulatum

I'd be happy to be proven wrong though.