Does art imitate life, or is it the other way around?

It was like something from a movie, art imitating life.

But she said it was not a case of art imitating life.

Then she looked up to find that art was imitating life.

Is this art imitating life, or the other way around?

"As art imitates life, we are certainly about that tonight."

Art is not imitating nature, it's the other way round.

Today we find the idea that art should imitate science troubling.

Though his art frequently imitates life, sometimes it's the other way around.

This is not a case of art imitating life.