Oriental rugs look different depending on which angle of the rug you are looking from - there is a light side and a dark side. If you are standing from the top end the rug will look markedly lighter. This results from the weaving process as each knot is hand-tied and pulled down. This creates the nap of the rug with all of the fibers laying in the same direction. Looking at the fibers in from the opposite side will make the rug darker.
Maybe people are the same - with a light side and a dark side. So what's the solution.
Step around them 180 degrees and look at the other side.