It's not plaster!
Unfortunately, I don't have a picture

No seams anywhere, so it's something that's been applied... hence the description of "liquid" tiles

It might be concrete, but it still doesn't quite feel like it.
The texture looks like sponge-painted walls, more or less. Texture everywhere but not the dotted texture of plaster, more drawn this way and that to achieve a lively result...
Did anyone get any wiser?
