Which is a visual cue that provides information about the distance of objects from the viewer?

The correct answer is a monocular depth cue. Monocular depth cues are visual indicators that allow us to perceive depth and distance even when viewing the world with just one eye. These cues are essential for understanding the spatial relationships between objects in our environment.

Monocular depth cues include several specific types, such as linear perspective, interposition, relative size, and texture gradient, which all help to convey information about how far away objects are from the viewer. For instance, texture gradient refers specifically to the gradual change in texture detail that occurs as objects get further away, while relative size indicates that we perceive larger objects as being closer.

In contrast, the other options do not effectively represent a visual cue for distance from the viewer. Contiguity refers to the principle that things that occur close together in time or space are perceived as related, and closure is a perceptual tendency to complete incomplete figures. While these concepts are important in understanding perception, they do not specifically relate to the cues used to gauge distance and depth visually.