A very characteristic morphological human feature is eye folds. Although about half of the human population does not have any eye folds, the other half shows a variety of different folds. The most common and well-known eye fold is the Mongolian fold, most common in East Asia.
Eye folds can appear partially or in full expression. They may produce the "slanting eyes". Here only a few very well-known folds are illustrated. There exists a variety of other types, especially in pathological cases.