Closeness of images to the horizon is a monocular depth cue that helps in perceiving depth.

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Monocular cues, which enable depth perception with a single eye, include several types. Key examples are linear perspective, where parallel lines appear to converge; interposition, which involves the partial overlap of objects; and the relative size of objects and their closeness to the horizon.

Examples of Monocular Cues

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

Linear perspective is a monocular cue where depth is perceived from the apparent convergence of two parallel lines in a two-dimensional image. A classic example is a photograph of a long, straight road, where the parallel edges of the road appear to meet at a point on the horizon.

Linear Perspective

You are looking at a photograph of a long, straight railroad track stretching into the distance. The two parallel rails appear to get closer together and eventually meet at a single point on the horizon. This visual effect, which helps you perceive the great distance of the track, is an example of which principle?

Interposition is a monocular depth cue that refers to the partial overlap of objects.

Interposition

Relative size of images is a monocular depth cue that helps in perceiving depth.

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