The document discusses the principle of unity in art, which organizes the elements of an artwork to create a sense of oneness. It describes five ways to achieve unity: simplicity by limiting elements, proximity by grouping objects closely, repetition of elements, alignment of elements to lead the eye, and continuity of lines or shapes to connect areas. It provides examples of Paul Cezanne's still life painting demonstrating proximity, simplicity, repetition, continuity and alignment, and a painting by Bernard Hoyes showing proximity, simplicity, repetition, continuity and alignment through the dancing figures.