The top of a convex or bulging item appears light coloured while the bottom appears darker. Thus, our visual system appears to interpret such stimuli as if they were illuminated from directly above. The cue to depth that seems to be at work in this context is
A) shading.
B) haze.
C) texture.
D) elevation.
E) convergence.

Question

Quizplus · Accepted Answer

Shading is a cue to depth perception that involves changes in light and shadow to suggest form and contours. When an object is convex, the way it is shaded, with the top appearing lighter and the bottom darker, suggests to our visual system that it is being illuminated from above, helping to perceive its shape and depth.

The Top of a Convex or Bulging Item Appears Light