consciousness does not change. It is continuous, one and continuous. Consciousness in itself cannot be formed. Just because the contents of the room have changed, does not mean the light has changed. What reveals remains the same. The body can be dramatized by an accident or a disease. And consciousness, it reveals the injured body.
Inspired by the 15th chapter of the Ashtavakra Gita, Swami Sarvapriyananda gives a discourse on the nature of the Self.