Human beings experience the world through the sense organs. This occurs both in the waking and the dream states.
One then assigns names and forms to the objects of the senses.
It can be safely said that names and forms account for all of human experience. Consciousness appears to be the common factor underlying this entire experience.
The final means of knowledge in ancient Indian philosophy is the experience of truth. “Enlightenment”, however one may define it, is said to be achieved via Jivanmukti (liberation while one is alive).