What does change and unity mean in sketch composition?

Change - is the contrasting effect caused by the juxtaposition of different factors. The differences and contradictions caused by the structure, shape, proportion, light and shade in the modeling factors are called "changes". The essence of the change is a double ratio relationship. The changes tend to be dynamic and contrasting, giving people a fresh, strong, rich and diverse feeling. However, excessive contrast can easily cause confusion, looseness and loss of beauty.

Unity - refers to the interconnection between the still life objects in the composition.

?Through various identical or similar factors, the organically connected whole composed of changed parts is called "unity".

The essence of unity is a harmonious relationship.

?Unified, tending to a sense of tranquility, giving people a sense of stability, harmony, and orderliness.

However, excessive uniformity can easily lead to monotony, overwhelm and loss of beauty.

The change and unity in the composition can be manifested in the formal rules such as symmetry and balance, contrast and harmony, stability and proportion in the composition.

The balance of different quantities is the same shape but different quantities. (As shown in the picture below: Use apples of different sizes on the left and right to achieve balance in the picture)

Isosized balance means different shapes and the same amount. (As shown in the picture below: Use special-shaped plates on the left and right to achieve the balance of the picture)

In intentional balance, use virtual and real, echo, and association to achieve the balance of the composition.