(1) Regarding ink, the relative thickness of a layer of printed ink. (2) Regarding color, the relative ability of a color to absorb light reflected from it or block light passing through it. (3) Regarding paper, the relative tightness or looseness of fibers. <br><br>May refer to the variations perceived in the sight of objects near and far due to atmospheric variations ? gases, moisture, dust, smoke, and temperature ? as well as to seeing through such potentially translucent materials as glass and plastic. Another way to refer to aerial perspective.Quote: "When you draw things very light and less distinct than darker objects in your picture, they will appear to be farther away. Darker objects with more detail look closer than lighter, hazy objects. Think of looking out a window in a tall building. The buildings and trees across the street look clear, and you can see lots of detail. The buildings and trees farther away look a little hazy, with less recognizable detail. This is because of the atmosphere between yourself and the object. Or if you&#39;re in a big city, it&#39;s caused by pollution. Yucko!" Mark Kistler, American TV artist / instructor. "The Twelve Renaissance Words of Drawing in 3-D," 1997. Also see refraction.