1. A piece of paper looks white in both the noon day sun andunder moonlight, even though there is less light being reflectedoff the paper under moonlight. This form of perceptual constancy iscalled ______.
2. Visual distance and depth cues that require the use of botheyes are called ______.
3. The distance cue in which two parallel lines extend into thedistance and seem to come together at one point is called______.