Which element of art refers to the illusion of three dimensions?

The concept of "form" refers to the representation of three-dimensional objects within a two-dimensional space. In art, form embodies volume and mass, allowing artists to create works that appear three-dimensional, even on a flat surface. This is typically achieved through techniques such as shading, perspective, and the use of light and shadow, which can give the viewer an illusion of depth.

When artists depict forms, they evoke thoughts of solidity and spatial relationships, as one might see in sculptures or realistic drawings of objects. This ability to illustrate three dimensions is key in creating artworks that engage viewers more fully, allowing them to perceive depth and realism.

Other elements, like shape, predominantly convey two-dimensional figures, while texture refers to the surface quality of an object and space denotes the area around, above, and between objects. These elements have their distinct characteristics and roles in art but do not specifically convey the three-dimensional illusion that is intrinsic to the understanding of form.