Consciousness, vision and memory

The original function of consciousness was probably to direct a mobile self to a fresh supply of food. 

Consciousness is dependent on vision. Vision adds context and depth to our world.  It adds a new dimension to awareness. 

The next step is to visualise food in its absence, so a self needs an inner representation of the world to remain focused on its food. 

Memory helps to return to the food source after some distraction.