Ordinarily we need to know not only what something is, but also where it is. Because vision doesn't give us this information directly, we must infer it. Explain five of the visual cues listed in the textbook

What will be an ideal response?

Answer: A good answer will include five of the following key points.
? Convergence—The eyes turn inward when looking at a close object; the degree of convergence corresponds to the closeness of the object.
? Retinal disparity—The two eyes see slightly different images of the world; This difference can be used to infer depth.
? Interposition—Closer objects partially block our view of more distant objects.
? Linear perspective—When two parallel lines are viewed receding into the distance, they appear to converge.
? Light and shadow—Light and shadow give objects the appearance of three dimensions.
? Motion parallax—When an observer is moving, objects appear to move at different speeds and in different directions depending on their distance from the observer.
? Relative size—The smaller an object's image on the retina, the farther away the object appears.
? Texture gradients—Distant parts of a uniform surface appear denser; that is, its elements seem spaced more closely together.
? Height in plane—Objects that are higher in our visual field are perceived as further away than objects low in our visual field.