For an individual, the concrete reality is the meaning. And also the meaning of the whole room is what holds it all together as a room. The meaning of your life is what would hold it together. If it lacks that meaning, then you feel it is falling apart. If society lacks a common meaning, or the culture lacks it, it won't hold.
Culture is the shared meaning.
And meaning includes not only significance, but also value and purpose. I am saying that common significance, value and purpose will hold the society together. If society does not share those, it is incoherent and it goes apart. And now we have a lot of subgroups in our society which don't share meanings, and so it actually starts to fall apart. It sounds as though they couldn't really.