The Hindu temples and the art forms that developed around them have, as have literature and philosophies, contributed greatly to the Indian culture. It was by imbibing the tribal cultural traditions that existed in different part of the country that Hinduism achieved its development. This is exemplified by the cultural traditions existing in South India and North East India. There existed in South India very strong Dravidian traditions, schools of thought, and systems of belief at the time when the process of Aryanization was going on. To cite a model: the literature of the Samgha period. Thirukural, the Tamil classic and the other works of the Samgha period, and the gods like kotavei are other examples of the Dravidian tradition, different from the Aryan.