The paper in the book that Jerome is reading appears to be white regardless of whether

he is reading the book outdoors or inside his apartment and regardless of whether he is
sitting in the shade, in the sun, or under a lamp.

Jerome's perception of the color of the
paper is an example of the principle called
a. haze.
b. brightness constancy.
c. the illumination illusion.
d. perceptual invariance.
e. shading.

b. brightness constancy.