Roy Fox Lichtenstein was an American pop artist he expressed his work through parody whereas Keith Allen Haring responded to the New York City street culture of the 1980s by expressing things with deep meanings.
When you use critical thinking you have to simplify it. There is a sequence in the way you think to help your brain understand. If you’re not thinking logically and rationally then things won’t make very much sense. Sorry I answer that weirdly but I hope that helped.