In their attempts to understand why people like certain colors, scientists have focused oon evolution. The main theory is that we like colors that are tied to things that are healthy and promote survival. A blue sky, for example, indicates calm weather, which might explain why blue tends to be a favored color across cultures. Dark yellows and oranges, on the other Hand, invoke urine, feces, vomit and rotting food. as expected, there is usually a dip in preference for these hues in studies around the world.