Robert Nisbet promoted the idea
The factors that contributed to the development of High Renaissance painting were twofold. Traditionally, Italian artists had painted in tempera paint. During the High Renaissance, artists began to use oil paints, which are easier to manipulate and allow the artist to create softer forms .
Symbolic proportion is the apparent disproportionate relationship between objects within a piece.
Others define symbolic proportion as the creation of an apparently disproportionate relationship in order to convey the importance of something.
