| Question | Answer |
| Size constancy | We perceive an object as the same size even when its distance from us changes. |
| Relative size | Smaller objects are perceived as further away than larger ones. |
| Texture gradient | An area with a detailed pattern is perceived to be nearer than one with less detail. |
| Height in the plane | Objects closer to the horizon are perceived to be more distant than the ones below or above the horizon. |
| Superimposition | A partly hidden object must be further away that the object covering it. |
| Linear perspective | Parallel lines appear to converge in the distance. |
| Stereopsis | A binocular cue to depth. The greater the difference between the view seen by the left eye and the right eye, the closer the viewer is looking. |
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