Form is simply a shape in three dimensions that encloses volume. Forms can also be geometric or organic.

**Geometric forms** are precise and can be defined mathematically, for example sphere, cube, pyramid, cone, and cylinder.

Geometric forms are related to geometric shapes. A circle becomes a sphere in three dimensions, a square becomes a cube, a triangle on a square base becomes a pyramid or on a circular base becomes a cone.

Geometric forms are precise and can be defined mathematically, for example sphere, cube, pyramid, cone, and cylinder.

Geometric forms are related to geometric shapes. A circle becomes a sphere in three dimensions, a square becomes a cube, a triangle on a square base becomes a pyramid or on a circular base becomes a cone.

**Organic forms** are those that are free-flowing, curvy or sinewy. They most often occur in nature, as in the shapes of flowers, branches, leaves, puddles, clouds, animals, the human figure etc..

The illusion of form can be created in 2D by adding shading and contrast.

Angular forms suggest solidity and structural strength.

Curved forms are graceful.