In the painting observed by Leonard, what depth cue is used when the artist makes closer trees appear rough and detailed?

The correct choice is based on the visual representation of texture changes that occur with distance. Texture gradient refers to the way detailed and rough textures are perceived as closer, while smoother and less detailed textures are seen as being farther away. In the example of the painting, the trees that are depicted with more detail and roughness represent this concept, indicating that they are closer to the viewer.

The visual characteristics of the texture give cues to the brain about the spatial arrangement of objects. As objects recede into the distance, they tend to lose detail and appear smoother, which helps the observer gauge their relative distance in a two-dimensional representation. This subtle use of texture in artwork assists in creating a sense of depth and dimension, making it an essential depth cue in both perception and artistic representation.