Right, that's what I meant. I also think one of approaches to understanding is layered. It is like you said: "Yes, they are, but they are also much more". It is worth it to find something first and then move next.

To notice about Andy, one of the features of his works is leaving the paint smeared. Being able to reproduce any image "ideally" with his technique, he hasn't always done it. It is partly fun to see when people, considering all backgrounds, take pop art for granted calling it "pop art" as though it defines everything.