Without light there is nothing to connect the eye to the object. Without light, there is no life. Very few creatures are able to live in darkness. There is a medical condition called SAD, which happens when you don't get enough sunlight. When the days get short and the skies turn gray, people tend to become listless, lazy, irritable, even depressed.
People tend to hibernate, they hunker in for a long winter's nap.
It isn't quite so bad here in sunny southern California, except for those handful of rainy days that break up our sunshine. In fact all this winter sunshine takes some getting used to, for someone who is from the northern Midwest. When I think of winter, I think of my four years at the University of Chicago. Gray limestone buildings with gray gargoyles rising out of gray snow against a gray winter sky. By the end of January, your eyes ached for color - red, orange, yellow, anything to break up the gray.