Textured ceilings probably help hide things, but why the lines?
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People being confidently wrong in the comments again. It’s the seam between two pre-cast hollow-core slabs. This is how every single apartment building is built at where I live.
My garage was constructed with those at my old house. Allows you to have usable space under the garage. But it leaks when they install incorrectly – no membrane was installed on the top side and they put the lumber walls on the same cement block as the spancrete. They are supposed to build up a half course of cement block so that the base of the lumber walls sits higher than the garage floor.