To experience lightness constancy, it is necessary to view the light reflected by any object relative to the light reflected by surrounding objects. Lightness constancy is defined as the tendency to perceive little variation in the lightness of objects.
Mostly through research, psychology students aim to unearth the root causes of human behavior and ways in which abnormal behavior can be recified. However, as the famous researcher Thomas Szasz once said - abnormality is only a result of the surrounding cultural environment - it's relative.
relative deprivation
Behavioral genetics
Relative deprivation is defined as the perception of an unfair disparity between ones situation and that of others. A simple example is a child who puts up a fuss and won't eat his dinner because he/she wanted chicken nuggets and is served tuna casserole. The child's feeling of being deprived is relative when you know that thousands of children around the world have nothing to eat at all. Even adults have endless lists of complaints that, if you think about them, are minor inconveniences and irritations when compared to what many people have to endure.
Behavior genetics.
Temperature is relative to the humidity of the surrounding.
Light is reflected and refracted in a diamond based on the angles of its facets relative to the source of the light.
Light hitting a flat mirror at an angle is reflected at the same angle, relative to the mirror surface.
relative location
The age of rock surrounding the fossil.
An anticyclone is a region of high atmospheric pressure relative to the surrounding air.