What is positive shape

In the artwork "that gentleman" by andrew wyeth what colors are present in the painting?

Spencer's blog claims that national parks are the best vacation destinations. which evidence is best for developing his claim? a personal account from a park visitor who describes positive adventures at grand canyon and yellowstone parks an interview with a travel agent who advertises cruises, eco-tours, and whitewater rafting trips a chart that compares the number of national parks in the eastern united states to that in the western states a study that proves adults who take yearly vacations have lower blood pressure than those who do not

Why were renaissance artists influenced by ancient greek and roman temples and buildings?