A cell membranes function is to protect the integrity of the interior of the cell by allowing certain substances into the cell while keeping other substances out.
I would say that a combination of vivid imagery and a portrayal of things as they really are would be the lessons learned by Hemingway from the paintings of the French post-impressionist Paul Cezanne. Cezanne's portrayal I'm warm colours of people and things makes his images very attractive.
