Beauty is in the eye of the beholder, and this is never more true than seen over time and between different cultures. Over time, our concept of beauty seems to fluctuate, particularly concerning people, sometimes favoring rather heavy individuals and at other times very skinny ones. In different cultures, parts of the body may be purposefully exaggerated in the name of beauty, the effects of which might even seem grotesque to those of another culture. For example, various tribes throughout the world use different methods to lengthen necks, exaggerate mouths, ears and even the shape of the head.