Sankhya is one of the most ancient philosophies which gives you a working knowledge of the world, material world and about Purusha and Prakruti. Prakruti is the world and Purusha is the consciousness. And the aim of Kaivalya is to free oneself from Prakruti and remain in the pure state of Purusha. It considers Prakruti not as an illusion but as an impermanent thing that keeps moving while the Purusha is always there, permanently.