Final answer:
Sculpting with a 90-degree or above projection uses Orthographic projection, which is different from perspective projection used in artworks to illustrate depth, such as atmospheric perspective.
Step-by-step explanation:
Sculpting at a 90 degree or above projection refers to Orthographic projection. This type of projection is used to create a clear portrayal of the object without distortion that may occur in other types of projections. Unlike perspective projection, which involves projection lines converging at a vanishing point to create a realistic image with depth, orthographic projection involves projection lines that are parallel to each other, ensuring the dimensions and angles are preserved accurately across the views.
For instance, in orthographic projection, artists and engineers can represent three-dimensional objects from different viewpoints (such as top, front, and side), which is essential for technical drawings. However, when artists aim to mimic how we see the world, they may use perspective projection. An example is the use of atmospheric perspective in landscape paintings, like Albert Bierstadt's 1863 painting of The Rocky Mountains, Lander's Peak, where distant objects appear smaller, grayer, and less distinct to imply depth.