Egg (food)
In most of the United States, eggs are generally white; while in the northeast of that country and in the United Kingdom, eggs are generally light-brown. People in Brazil and Poland prefer brown or reddish eggs, because white eggs are thought of as "industrial", that is, for use in commercial bakeries.  The reason some people prefer one colour of egg and other people prefer a different colour is probably because of what the colours are linked with in their minds.  For example white is linked with purity, and brown-shelled eggs with greater wholesomeness.