Greek dances (horos) is a very old tradition, being referred to by authors such as Plato, Aristotle, Plutarch and Lucian.There are different styles and interpretations from all of the islands and surrounding mainland areas. Each region formed its own choreography and style to fit in with their own ways. For example, island dances have more of a different smooth flow to them, while Pontic dancing closer to Black Sea, is very sharp. There are over 10 000 traditional dances that come from all regions of Greece. There are also pan-Hellenic dances, which have been adopted throughout the Greek world. These include the syrtos, kalamatianos, pyrrhichios, hasapiko and sirtaki.