Why civilization? The answer marks the first singularity, the contradiction of all that went before. Our current Lebenswelt is not "the Lebenswelt that we evolved in". "Everything that we evolved to be" passed through this singularity. Social complexity was no longer constrained. We forgot who we were. We had to define who we are. We became civilized.
But what is "civilization"?
"Civilization" is what we say it is.
Of course, this is madness. But look around you. What isn't madness?
The first singularity left a fairy tale trace. Look in the Bible. The trace begins at Genesis 2:4.
Here stands a portal to the Fourth Age of Understanding. The Age of Semiotics begins.