Those of a white or light color.
What objects reflect the least light?
Those of a darker color; and the nearer the color approaches to black, the less light it reflects.
Why is it darker when the sky is covered by dark-colored, than by light-colored, clouds?
Because the dark-colored clouds reflect less light, than the light-colored clouds do.
What advantage do we derive from the green color of the grass and the leaves?
They reflect a soft, pleasant light, which does not dazzle or hurt our eyes.
How would it be if those objects were white?
They would dazzle us by the amount of light reflected.
If we wish to make a room light, of what color should the walls be?