In the Western world, black is most often used with a negative connotation. The reasons for this are various, but the most widely accepted explanations are that night is experienced by humans as negative and dangerous. A secondary reason is that stains are most visible as dark additions to pale materials. However, black can have positive symbolism. In Western fashion, black is considered reliably stylish. The colloquialism "the new black" is a reference to the latest trend or fad, on the basis that black is always fashionable. Black is seen as a color of seriousness and authority.